| O02 | Nervino Airport | Beckwourth CA |
| O03 | Morgantown Airport | Morgantown PA |
| O05 | Rogers Field Airport | Chester CA |
| O06 | Lake Oroville Landing Area Seaplane Base | Oroville CA |
| O07 | Westheimer Air Park Airport | Houston TX |
| O08 | Colusa County Airport | Colusa CA |
| O09 | Round Valley Airport | Covelo CA |
| O12 | Grand Lake St Marys Seaplane Base | St Marys OH |
| O13 | Haddock Field Airport | Erick OK |
| O14 | Neil's Sky Ranch Airport | Ninnekah OK |
| O15 | Turlock Muni Airport | Turlock CA |
| O16 | Garberville Airport | Garberville CA |
| O18 | Buzzards Roost Airport | Inola OK |
| O19 | Kneeland Airport | Eureka CA |
| O20 | Kingdon Airpark Airport | Lodi CA |
| O21 | Hoopa Airport | Hoopa CA |
| O22 | Columbia Airport | Columbia CA |
| O24 | Lee Vining Airport | Lee Vining CA |
| O26 | Lone Pine Airport | Lone Pine CA |
| O27 | Oakdale Airport | Oakdale CA |
| O28 | Ells Field-willits Muni Airport | Willits CA |
| O32 | Reedley Muni Airport | Reedley CA |
| O33 | Samoa Field Airport | Eureka CA |
| O34 | Molly's Landing Heliport | Catoosa OK |
| O35 | Hollis Muni Airport | Hollis OK |
| O37 | Haigh Field Airport | Orland CA |
| O38 | Gundys Airport | Owasso OK |
| O39 | Ravendale Airport | Ravendale CA |
| O41 | Watts-woodland Airport | Woodland CA |
| O42 | Woodlake Airport | Woodlake CA |
| O43 | Yerington Muni Airport | Yerington NV |
| O44 | Mc Caslin Airport | Lexington OK |
| O45 | Hooker Muni Airport | Hooker OK |
| O46 | Weed Airport | Weed CA |
| O47 | Prague Muni Airport | Prague OK |
| O51 | Laverne Muni Airport | Laverne OK |
| O52 | Sutter County Airport | Yuba City CA |
| O53 | Medford Muni Airport | Medford OK |
| O54 | Lonnie Pool Field/weaverville Airport | Weaverville CA |
| O55 | Southard Field Airport | Bieber CA |
| O57 | Bryant Field Airport | Bridgeport CA |
| O59 | Cedarville Airport | Cedarville CA |
| O60 | Cloverdale Muni Airport | Cloverdale CA |
| O61 | Cameron Airpark Airport | Cameron Park CA |
| O63 | Exeter Airport | Exeter CA |
| O64 | Port Of Catoosa Heliport | Catoosa OK |
| O65 | Christman Airfield Airport | Okeene OK |
| O66 | Homestead Farms Airport | Pond Creek OK |
| O69 | Petaluma Muni Airport | Petaluma CA |
| O74 | Elliotts Landing Airport | Mount Victory OH |
| O79 | Sierraville Dearwater Airport | Sierraville CA |
| O81 | Tulelake Muni Airport | Tulelake CA |
| O85 | Benton Field Airport | Redding CA |
| O86 | Trinity Center Airport | Trinity Center CA |
| O88 | Rio Vista Muni Airport | Rio Vista CA |
| O89 | Fall River Mills Airport | Fall River Mills CA |
| OA00 | Taildragger Airport | Cambridge OH |
| OA03 | B & W Metals Company Heliport | Fairfield OH |
| OA04 | Rutter Airport | Arcadia OH |
| OA06 | Affinity Medical Center Heliport | Massillon OH |
| OA07 | Hemlock Field Airport | Rock Creek OH |
| OA08 | Medflight Heliport | Columbus OH |
| OA09 | Madison County Hospital Heliport | London OH |
| OA10 | Workman's Landing Airport | Mount Orab OH |
| OA11 | Heitman Field Airport | Anna OH |
| OA12 | Buena Vista Farm Airport | Morrow OH |
| OA14 | Roxford Airport | Dennison OH |
| OA15 | Fort Hamilton Hospital Heliport | Hamilton OH |
| OA16 | Lost Bridge Airport | North Bend OH |
| OA17 | Bucyrus Community Hospital Heliport | Bucyrus OH |
| OA18 | Creekside Ridge Heliport | Cuyahoga Falls OH |
| OA19 | Kiko Farm Airport | North Canton OH |
| OA21 | Fuller Heliport | Chagrin Falls OH |
| OA22 | Bethesda North Hospital Heliport | Montgomery OH |
| OA23 | Heins Field Airport | Arcanum OH |
| OA52 | Ross Heart Hospial Heliport | Columbus OH |
| OA60 | Green Heliport | Cincinnati OH |
| OA85 | Riverview Airport | Dresden OH |
| OAJ | Albert J Ellis Airport | Jacksonville NC |
| OAK | Metropolitan Oakland Intl Airport | Oakland CA |
| OAR | Marina Muni Airport | Marina CA |
| OBE | Okeechobee County Airport | Okeechobee FL |
| OBI | Woodbine Muni Airport | Woodbine NJ |
| OBU | Kobuk Airport | Kobuk AK |
| OCF | Ocala Intl-jim Taylor Field Airport | Ocala FL |
| OCH | A L Mangham Jr. Rgnl Airport | Nacogdoches TX |
| OCQ | J. Douglas Bake Memorial. Airport | Oconto WI |
| OCW | Warren Field Airport | Washington NC |
| ODO | Odessa-schlemeyer Field Airport | Odessa TX |
| ODX | Evelyn Sharp Field Airport | Ord NE |
| OEB | Branch County Memorial Airport | Coldwater MI |
| OEL | Oakley Muni Airport | Oakley KS |
| OEO | L O Simenstad Muni Airport | Osceola WI |
| OFF | Offutt Afb Airport | Omaha NE |
| OFK | Norfolk Rgnl/karl Stefan Memorial Fld Airport | Norfolk NE |
| OFP | Hanover County Muni Airport | Richmond/ashland VA |
| OG00 | 3 Rivers Recreation Area Airport | Culver OR |
| OG01 | Dunning Vineyards Airport | Corvallis OR |
| OG02 | Rieben Airport | Banks OR |
| OG03 | Columbia Memorial Hospital Heliport | Astoria OR |
| OG05 | Sundance Meadows Airport | Bend OR |
| OG06 | Table Rock Airport | Christmas Valley OR |
| OG07 | Cove Side Ranch Port Airport | Cove OR |
| OG09 | Good Shepherd Hospital Heliport | Hermiston OR |
| OG10 | Mt Hope Airport | Lebanon OR |
| OG11 | Rose Garden Heliport | Portland OR |
| OG13 | Fly By Night Airport | Ruch OR |
| OG14 | Ponderosa Ranch Airport | Seneca OR |
| OG15 | Sage Ranch Airport | Sisters OR |
| OG16 | Jim's Airstrip Airport | Halsey OR |
| OG19 | Bombay Farms Airport | Madras OR |
| OG20 | Fairways Airport | Oregon City OR |
| OG21 | Dry Creek Airpark Airport | Prineville OR |
| OG23 | Poverty Hollow Airport | Sheridan OR |
| OG24 | Flying D Ranch Airport | Sutherlin OR |
| OG25 | Firefly Ranch Airfield Airport | White City OR |
| OG27 | Muddy Creek Airport | Haines OR |
| OG28 | The Green Trees Ranch Airport | Scio OR |
| OG29 | Mc Kinnon Airpark Airport | Sandy OR |
| OG30 | Aeroacres Airport | Oregon City OR |
| OG31 | Shady Cove Airpark Airport | Shady Cove OR |
| OG32 | Mahlon Sweet Field Heliport | Eugene OR |
| OG33 | Oregon Sky Ranch Airport | Milton/freewater OR |
| OG34 | Meyer Riverside Airpark Airport | Tigard OR |
| OG35 | Mountain View Hospital Heliport | Madras OR |
| OG36 | Munson Airport | Junction City OR |
| OG37 | Salem Hospital Heliport | Salem OR |
| OG38 | Willamette Valley Medical Center Heliport | Mcminnville OR |
| OG39 | Longview Ranch Airport | Kimberly OR |
| OG40 | Napier Ranch Airport | Roseburg OR |
| OG41 | Nace Family Airstrip Airport | Glendale OR |
| OG42 | Quail Field Airport | Pendleton OR |
| OG44 | Watts Landing Airport | Amity OR |
| OG45 | Bald Mountain Airport | Baker City OR |
| OG46 | Tuality Hospital Heliport | Hillsboro OR |
| OG47 | Three Valleys Ranch Heliport | Baker City OR |
| OG48 | Greer Airport | Coburg OR |
| OG49 | Coca Cola Airport | Corvalis OR |
| OG50 | Cottonwood Creek Ranch Airport | Harper OR |
| OG51 | Six Springs Ranch Airport | Madras OR |
| OG52 | Jpm Airport | Monmouth OR |
| OG53 | Wildhorse Valley Airport | Andrews OR |
| OG54 | Shaniko Cattle Airport | Shaniko OR |
| OG55 | Providence Newberg Medical Center Heliport | Newberg OR |
| OG56 | Station Thirty Heliport | Astoria OR |
| OG57 | Pier 126 Heliport | Florence OR |
| OG58 | Erickson Air-crane Admin Offices Heliport | Central Point OR |
| OG62 | Myrtle Creek Muni Heliport | Myrtle Creek OR |
| OG63 | Gilbert Airport | North Plains OR |
| OG64 | River Bend Hospital Heliport | Springfield OR |
| OGA | Searle Field Airport | Ogallala NE |
| OGB | Orangeburg Muni Airport | Orangeburg SC |
| OGD | Ogden-hinckley Airport | Ogden UT |
| OGG | Kahului Airport | Kahului HI |
| OGM | Ontonagon County - Schuster Field Airport | Ontonagon MI |
| OGS | Ogdensburg Intl Airport | Ogdensburg NY |
| OH01 | Grant Medical Center Heliport | Columbus OH |
| OH03 | Woodworth Airport | Madison OH |
| OH05 | Akron General Medical Center Heliport | Akron OH |
| OH07 | Sunset Strip Airport | Marlboro OH |
| OH13 | Bulick Field Airport | Minerva OH |
| OH15 | Minerva Airport | Minerva OH |
| OH17 | August Acres Airport | Center Village OH |
| OH18 | Freefall Field Airport | Sycamore OH |
| OH19 | Hiltner Airport | North Creek OH |
| OH21 | Horning Airport | Galion OH |
| OH22 | Stoltzfus Airfield Airport | Kidron OH |
| OH23 | O'bleness Memorial Hospital Heliport | Athens OH |
| OH25 | Grady Memorial Hospital Heliport | Delaware OH |
| OH26 | Birdland Airport | Thompson OH |
| OH27 | Salem Lakefront Airport | Salem OH |
| OH28 | Donner Field Airport | Leesburg OH |
| OH29 | Petersburg Airport | Petersburg OH |
| OH30 | Whalen Heliport | Amelia OH |
| OH31 | Sycamore Hospital Heliport | Miamisburg OH |
| OH32 | Stone Airport | Alvada OH |
| OH34 | Leis Airport | Ansonia OH |
| OH35 | Mission Field Airport | Hallsville OH |
| OH36 | Riverside Airport | Zanesville OH |
| OH38 | Blue Bird Airport | Belpre OH |
| OH42 | Hawk's Nest Airport | Butler OH |
| OH44 | Grover Airport | Cheshire OH |
| OH45 | Drake Airport | Bowling Green OH |
| OH46 | Medical Center Hospital Heliport | Chillicothe OH |
| OH47 | District 9 Heliport | Chillicothe OH |
| OH48 | Alliance Airport | Alliance OH |
| OH49 | Christ Hospital Heliport | Cincinnati OH |
| OH50 | Lindsey L.s. Airport | Circleville OH |
| OH51 | Miami Valley Career Technology Center Airport | Clayton OH |
| OH52 | Columbus Heliport | Columbus OH |
| OH53 | Ohio Bldg Authority Heliport | Columbus OH |
| OH54 | Ohio State University Hospital Heliport | Columbus OH |
| OH56 | Good Samaritan Hospital Heliport | Dayton OH |
| OH57 | Berlin Station Lndg Strip Airport | Delaware OH |
| OH58 | Cow Chip Creek Heliport | Morrow OH |
| OH59 | Mc Intosh Airport | Farmersville OH |
| OH60 | Gerker Airfield Airport | Fort Jennings OH |
| OH61 | Amanda Airport | Amanda OH |
| OH62 | Southern Ohio Rgnl Medical Center Heliport | Portsmouth OH |
| OH63 | Jims Airport | Germantown OH |
| OH64 | Hummel Airport | Germantown OH |
| OH65 | Antique Acres Airpark Airport | Goshen OH |
| OH66 | Obannon Creek Aerodrome Airport | Goshen OH |
| OH68 | Raylene Airport | Harrison OH |
| OH69 | Highland District Medical Heliport | Hillsboro OH |
| OH70 | Gallenstein Heliport | Indian Hill OH |
| OH72 | Oak Hill Hospital Heliport | Oak Hill OH |
| OH73 | Fulton County Health Center Heliport | Wauseon OH |
| OH75 | Hardin Memorial Hospital Heliport | Kenton OH |
| OH76 | Waterwood Heliport | Vermilion OH |
| OH77 | Lumberton Airport | Wilmington OH |
| OH78 | Swigart Airport | Laura OH |
| OH79 | Vermilion Township Heliport | Vermilion OH |
| OH80 | District Nr 8 Heliport | Lebanon OH |
| OH82 | Graham Farm Airport | Adams Mills OH |
| OH83 | Lima Memorial Hospital Heliport | Lima OH |
| OH84 | Odot District Nr 1 Heliport | Lima OH |
| OH85 | Marietta Memorial Hospital Heliport | Marietta OH |
| OH86 | Deeds Field Airport | Sugar Grove OH |
| OH87 | Providence Hospital Heliport | Sandusky OH |
| OH88 | Baltic Heliport | Baltic OH |
| OH89 | Selby General Hospital Heliport | Marietta OH |
| OH91 | Dave Rice Airport | Lima OH |
| OH92 | Porter Airport | Hopewell OH |
| OH93 | Darby Airport | Milford Center OH |
| OH95 | Maplewood Orchard Airport | Morrow OH |
| OH96 | Neals Airport | Mount Orab OH |
| OH97 | Carcioppolo Field Airport | Mantua OH |
| OI01 | Lazy-w Airport | Logan OH |
| OI05 | Dana Heliport | Toledo OH |
| OI06 | Wagner Intl Airport | West Milton OH |
| OI07 | Varns Farms Airport | Wooster OH |
| OI08 | Davies Air Fld Airport | Wooster OH |
| OI11 | Hibbetts Airport | Carrollton OH |
| OI12 | Fly-a-way Farm Airport | Delaware OH |
| OI21 | Va Hospital Heliport | Chillicothe OH |
| OI23 | Emh Rgnl Medical Center Heliport | Elyria OH |
| OI24 | Kokosing Heliport | Fredericktown OH |
| OI25 | Ross Field Airport | Greenfield OH |
| OI28 | Lanker Airport | Mount Gilead OH |
| OI29 | Yellowbird Farm Airport | Otway OH |
| OI31 | Pheasant Run Airport | Leroy OH |
| OI32 | Stoney's Airport | Ravenna OH |
| OI33 | Ruhlin Heliport | Sharon Center OH |
| OI34 | Fricke Airport | Spring Valley OH |
| OI35 | Scott Park Heliport | Toledo OH |
| OI36 | Farpoint Airfield Airport | Gratis OH |
| OI37 | Rogers Heliport | Dayton OH |
| OI38 | Hillview Airstrip Airport | East Liberty OH |
| OI40 | Hallelujah Field Airport | Goshen OH |
| OI41 | Far View Airport | Hiram OH |
| OI42 | D. A. Chandler Airport | New London OH |
| OI43 | Back Achers Heliport | North Olmsted OH |
| OI44 | St Charles Hospital Heliport | Oregon OH |
| OI47 | Channel 10/wbns-tv Heliport | Columbus OH |
| OI48 | Tesar Heliport | Clyde OH |
| OI50 | 1st District Police Sta Heliport | Cleveland OH |
| OI51 | 4th Dist Police Station Heliport | Cleveland OH |
| OI52 | Lyons Field Airport | Jamestown OH |
| OI53 | St Vincent Hospital & Medical Center Heliport | Toledo OH |
| OI55 | Scheibe Field Airport | Wooster OH |
| OI56 | Lee's Dogpatch Airport | Kirkersville OH |
| OI57 | Mc Kinney Field Airport | Hamersville OH |
| OI58 | Lockeridge Airport | Canton OH |
| OI59 | Miller Airport | Chester OH |
| OI60 | Gorman Airport | Mansfield OH |
| OI61 | Mount Carmel Health Heliport | Columbus OH |
| OI62 | Rataiczak Airport | Russell OH |
| OI63 | Mildon Heliport | Tarlton OH |
| OI64 | Bush Field Airport | Thompson OH |
| OI65 | Aultman Hospital Heliport | Canton OH |
| OI66 | Eibling Circle E Airport | Dola OH |
| OI68 | Hilty Field Airport | Rittman OH |
| OI69 | Blackacre Farm Airport | Painesville OH |
| OI72 | Marvin Thiel Field Airport | Blakeslee OH |
| OI73 | Williamson Airport | Cedarville OH |
| OI75 | Macks Heliport | Columbus Grove OH |
| OI76 | Bieber's Seaplane Base | North Lima OH |
| OI77 | Mc Ardle Airport | Fostoria OH |
| OI78 | Diebleys Airport | Fostoria OH |
| OI79 | Memorial Hospital Heliport | Fremont OH |
| OI80 | T & A Land Development Heliport | Broadview Heights OH |
| OI82 | Russ Airport | Jackson OH |
| OI83 | Hillcrest Hospital Heliport | Mayfield Heights OH |
| OI84 | King Knoll Airport | Okeana OH |
| OI86 | Robinson Memorial Hospital Heliport | Ravenna OH |
| OI87 | Firelands Community Hospital Nr 2 Heliport | Sandusky OH |
| OI89 | Mite Airport | Camden OH |
| OI90 | Sheriff's Heliport | Marion OH |
| OI91 | Hammond Airport | Yellow Springs OH |
| OI92 | Conklin Airport | Bowling Green OH |
| OI93 | Alaimo's Heliport | Brecksville OH |
| OI94 | 9 Newsport Heliport | Cincinnati OH |
| OI95 | Nationwide Children's Hospital Heliport | Columbus OH |
| OI96 | National Heliport | Columbus OH |
| OI97 | St. Ann's Heliport | Westerville OH |
| OI98 | St Vincent Charity Medical Center Solon Heliport | Solon OH |
| OI99 | Mulholland Airport | Celina OH |
| OIC | Lt Warren Eaton Airport | Norwich NY |
| OIN | Oberlin Muni Airport | Oberlin KS |
| OJA | Thomas P Stafford Airport | Weatherford OK |
| OJC | Johnson County Executive Airport | Olathe KS |
| OK00 | Jacktown Airport | Jacktown OK |
| OK01 | Skyhaven Airpark Airport | Vera OK |
| OK02 | Dick's Airport | Goldsby OK |
| OK03 | Elgin's Stony Field Airport | Elgin OK |
| OK04 | Canadian River Ranch Airport | Eufaula OK |
| OK06 | Snake Creek Wilderness Airport | Cookson OK |
| OK07 | Djs Airport | Lawton OK |
| OK08 | Hill Top Pvt Airport | Lawton OK |
| OK09 | Mercy Memorial Health Center Heliport | Ardmore OK |
| OK10 | Entropy Airport | Elmore City OK |
| OK11 | Ksa Orchards Airport | Comanche OK |
| OK12 | Jones Farm Field Airport | Walters OK |
| OK13 | Erroport Airport | Mounds OK |
| OK14 | Woodlake Airport | Alva OK |
| OK15 | Avian Country Estates Airport | Oolagah OK |
| OK16 | Fairmont Field Airport | Fairmont OK |
| OK17 | Bass Aero Airport | Ardmore OK |
| OK18 | Grand Isle Airport | Adair OK |
| OK19 | Integris Baptist Medical Center Heliport | Oklahoma City OK |
| OK20 | Sageeyah Airfield Airport | Claremore OK |
| OK21 | Longs Airport North Airport | Pryor OK |
| OK22 | Bluebird Airpark Airport | Shawnee OK |
| OK23 | Taliaferro Field Airport | Ardmore OK |
| OK24 | Colby Field Airport | Lone Grove OK |
| OK25 | Cherokee Ranch Airport | Haskell OK |
| OK26 | Atwoods Heliport | Enid OK |
| OK27 | Venture Aerodrome Airpark Nr 2 Ultralight | Roland OK |
| OK28 | Mcdaniel Aviation Airport | Ravia OK |
| OK29 | Travis Airport | Marietta OK |
| OK30 | Grandcraft Landing Strip Airport | Langley OK |
| OK31 | Whittington Ranch Airport | Thackerville OK |
| OK32 | Triad Eye Medical Clinic Heliport | Muskogee OK |
| OK33 | Eastar Health System, East Campus Heliport | Muskogee OK |
| OK34 | Gustafson Airport | Sallisaw OK |
| OK35 | Choctaw Indian Hospital Heliport | Talihina OK |
| OK37 | Dog Iron Ranch Airport | Oologah OK |
| OK38 | Perry Memorial Hospital Heliport | Perry OK |
| OK39 | Judy Ranch Airport | Forgan OK |
| OK41 | Police Civic Center Heliport | Tulsa OK |
| OK43 | Logsdon Ranch Airport | Alva OK |
| OK45 | Collinsville Rural Fire District Heliport | Collinsville OK |
| OK46 | Mc Crays Airport | Manchester OK |
| OK47 | Miller Brothers Airport | Manchester OK |
| OK48 | Grass Roots Airport | Newkirk OK |
| OK49 | Secrest Ranch Airport | Ponca City OK |
| OK50 | Traynor Ranch Airport | Waukomis OK |
| OK51 | Enix Boys Airport | Hennessey OK |
| OK54 | May Ranch Airport | Alva OK |
| OK55 | Bost Ranch Airport | Luther OK |
| OK57 | Boeing Mrotc Heliport | Oklahoma City OK |
| OK58 | Bluestem Airport | Collinsville OK |
| OK59 | Wolf Mountain Airport | Poteau OK |
| OK62 | Strader Ranch Airport | Ardmore OK |
| OK65 | Cushing Rgnl Hospital Heliport | Cushing OK |
| OK66 | F.w. Zaloudek Airport | Kremlin OK |
| OK74 | Flying H Airport | Ashland OK |
| OK75 | Purcell Muni Hospital Heliport | Purcell OK |
| OK76 | Channel 8 Heliport | Tulsa OK |
| OK79 | Temple Airport Inc Airport | Temple OK |
| OK80 | Thomas Ranch Airport | Ada OK |
| OK82 | Scottys Field Airport | Altus OK |
| OK83 | Sheffield-smith Airstrip Airport | Altus OK |
| OK84 | Whittaker Army Heliport | Pryor OK |
| OK85 | Goddard Ranch Airport | Ardmore OK |
| OK86 | Stroud Hospital Heliport | Stroud OK |
| OK88 | Silverwood Ultralight | Broken Arrow OK |
| OK90 | Boatner Field Airport | Calera OK |
| OK92 | Wetumka Hospital Heliport | Wetumka OK |
| OK93 | Airman Acres Airport | Collinsville OK |
| OK94 | Sand Ridge Airpark Inc Airport | Collinsville OK |
| OK95 | Disney Airport | Disney OK |
| OK96 | Ives Airport | Wellston OK |
| OK97 | Ketchum Ranch Airport | Duncan OK |
| OK98 | King Airport | Eakly OK |
| OK99 | Unity Health Center Heliport | Shawnee OK |
| OKB | Oceanside Muni Airport | Oceanside CA |
| OKC | Will Rogers World Airport | Oklahoma City OK |
| OKH | Aj Eisenberg Airport | Oak Harbor WA |
| OKK | Kokomo Muni Airport | Kokomo IN |
| OKM | Okmulgee Rgnl Airport | Okmulgee OK |
| OKS | Garden County Airport | Oshkosh NE |
| OKV | Winchester Rgnl Airport | Winchester VA |
| OKZ | Kaolin Field Airport | Sandersville GA |
| OL00 | Pauls Valley State School Heliport | Pauls Valley OK |
| OL02 | West Buttercreek Airport | Echo OR |
| OL03 | Happy Valley Airport | Happy Valley OR |
| OL05 | Skydive Oregon Airport | Molalla OR |
| OL06 | Bristow Hospital Heliport | Bristow OK |
| OL07 | Carnegie Muni Hospital Heliport | Carnegie OK |
| OL08 | L.j. Pankey Heliport | Cheyenne OK |
| OL09 | Jennings Ranch Airport | Cooperton OK |
| OL11 | Medical Center Of Southeastern Oklahoma Heliport | Durant OK |
| OL14 | Harbor's In Heliport | Ketchum OK |
| OL15 | Midwest Rgnl Medical Center Heliport | Midwest City OK |
| OL16 | Mercy Health Center Heliport | Oklahoma City OK |
| OL17 | Stilwell Memorial Hospital Heliport | Stilwell OK |
| OL20 | Whitehorn Cove Airport | Wagoner OK |
| OL23 | Morris Airport | Sapulpa OK |
| OLD | Dewitt Fld,old Town Muni Airport | Old Town ME |
| OLE | Cattaraugus County-olean Airport | Olean NY |
| OLF | L M Clayton Airport | Wolf Point MT |
| OLG | Solon Springs Muni Airport | Solon Springs WI |
| OLM | Olympia Rgnl Airport | Olympia WA |
| OLS | Nogales Intl Airport | Nogales AZ |
| OLU | Columbus Muni Airport | Columbus NE |
| OLV | Olive Branch Airport | Olive Branch MS |
| OLY | Olney-noble Airport | Olney-noble IL |
| OLZ | Oelwein Muni Airport | Oelwein IA |
| OMA | Eppley Airfield Airport | Omaha NE |
| OME | Nome Airport | Nome AK |
| OMH | Orange County Airport | Orange VA |
| OMK | Omak Airport | Omak WA |
| OMN | Ormond Beach Muni Airport | Ormond Beach FL |
| OMU9 | Kollmeyer Airport | Pilot Grove MO |
| ONA | Winona Muni-max Conrad Fld Airport | Winona MN |
| ONL | The O'neill Muni-john L Baker Field Airport | O'neill NE |
| ONM | Socorro Muni Airport | Socorro NM |
| ONO | Ontario Muni Airport | Ontario OR |
| ONP | Newport Muni Airport | Newport OR |
| ONT | Ontario Intl Airport | Ontario CA |
| ONX | Currituck County Rgnl Airport | Currituck NC |
| ONY | Olney Muni Airport | Olney TX |
| ONZ | Grosse Ile Muni Airport | Detroit/grosse Ile MI |
| OOA | Oskaloosa Muni Airport | Oskaloosa IA |
| OOH | Hoonah Seaplane Base | Hoonah AK |
| OOK | Toksook Bay Airport | Toksook Bay AK |
| OPF | Opa-locka Executive Airport | Miami FL |
| OPL | St Landry Parish-ahart Field Airport | Opelousas LA |
| OPN | Thomaston-upson County Airport | Thomaston GA |
| OQN | Brandywine Airport | West Chester PA |
| OQU | Quonset State Airport | North Kingstown RI |
| OQW | Maquoketa Muni Airport | Maquoketa IA |
| OR00 | Flying K Ranch Airport | Beaverton OR |
| OR02 | River Run Ranch Airport | Redmond OR |
| OR03 | Redtail Ranch Airstrip Airport | Union OR |
| OR04 | Kennel Airstrip Airport | Bend OR |
| OR05 | Flying M Airport | Yamhill OR |
| OR06 | Snider Creek Airport | Medford OR |
| OR07 | Miranda's Skyranch Airport | Long Creek OR |
| OR08 | Barton Lake Ranch Airport | Diamond OR |
| OR09 | Whitehorse Ranch Airport | Fields OR |
| OR10 | Roaring Springs Ranch Airport | Frenchglen OR |
| OR11 | Jensens Strip Airport | Haines OR |
| OR12 | Oxbow Airport | Homestead OR |
| OR13 | Wiley Creek Airport | Dayville OR |
| OR14 | Juntura Airport | Juntura OR |
| OR15 | Horseman Heliport | Bend OR |
| OR16 | Black Bull Spring Ranch Airport | Arock OR |
| OR17 | Oxbow Ranch Airport | Prairie City OR |
| OR18 | Davis Heliport | Adams OR |
| OR19 | Propst Airport | Albany OR |
| OR20 | Hemmingson Airport | Albany OR |
| OR21 | Miller Airstrip Airport | Albany OR |
| OR22 | Roppair Airport | Albany OR |
| OR23 | Karpens Airport | Astoria OR |
| OR24 | Hts Aurora Heliport | Aurora OR |
| OR25 | Flying E Airport | Aumsville OR |
| OR26 | Farr Airport | Lakeview OR |
| OR27 | Chadwick Airport | Banks OR |
| OR28 | Harvey's Acres Airport | Beaverton OR |
| OR29 | Gopher Gulch Airport | Bend OR |
| OR30 | D M Stevenson Ranch Airport | Bend OR |
| OR31 | Sohler's Holly Hill Airport | Hillsboro OR |
| OR32 | Hooks Strip Airport | Burns OR |
| OR33 | Central Cascades Fire And Ems Heliport | Cresent Lake OR |
| OR34 | Whippet Field Airport | Sisters OR |
| OR35 | Flying K Bar J Ranch Airport | Boring OR |
| OR36 | Garvins Heliport | Brookings OR |
| OR37 | Lincoln Tower Heliport | Tigard OR |
| OR38 | Harchenko Industrial Airport | Brooks OR |
| OR39 | Flying Tom Airport | Corvallis OR |
| OR40 | Dietz Airpark Airport | Canby OR |
| OR41 | Workman Airpark Airport | Canby OR |
| OR43 | Hood River Fire Dept Heliport | Hood River OR |
| OR44 | Briggs Airport | Coburg OR |
| OR45 | West Point Airport | Coburg OR |
| OR46 | Ajax Airport | Condon OR |
| OR47 | Strauch Field Airport | Junction City OR |
| OR48 | Snyder Ranch Airport | Condon OR |
| OR49 | Bay Area Hospital Heliport | Coos Bay OR |
| OR50 | Lehman Field Airport | Corbett OR |
| OR51 | Gillette Field Airport | Scio OR |
| OR52 | Venell Airport | Corvallis OR |
| OR53 | Wapinitia Airport | Wapinitia OR |
| OR54 | Winn Airport | Corvallis OR |
| OR55 | Good Samaritan Hospital Heliport | Corvallis OR |
| OR56 | Holiday Airport | Corvallis OR |
| OR57 | Walker Airport | Creswell OR |
| OR59 | Trivelpiece Airport | Yamhill OR |
| OR61 | Apple Valley Airport | Buxton OR |
| OR63 | Seaside Heliport | Seaside OR |
| OR64 | Beach Ranch Airport | Enterprise OR |
| OR65 | Eagle Nest Ranch Airport | Estacada OR |
| OR66 | Beaver Oaks Airport | Estacada OR |
| OR68 | Columbia Helicopters Heliport | Aurora OR |
| OR69 | Sacred Heart General Hospital Heliport | Eugene OR |
| OR70 | Pine Valley Airport | Halfway OR |
| OR71 | Morgan's Airport | Ballston OR |
| OR72 | Fly Jla Airport | Boring OR |
| OR73 | Calvert Peak Airport | Glendale OR |
| OR74 | Winkle Bar Airport | Grants Pass OR |
| OR75 | Brownlee Heliport | Brownlee Village OR |
| OR77 | Faust Fld Airport | Independence OR |
| OR78 | Daniels Field Airport | Harrisburg OR |
| OR79 | Knox's Private Airstrip Airport | Harrisburg OR |
| OR81 | Olinger Airpark Airport | Hillsboro OR |
| OR83 | Oxbow Heliport | Oxbow Village OR |
| OR86 | Gilmour Ag Air Airport | Jefferson OR |
| OR87 | Blue Skies Farm Airport | Salem OR |
| OR88 | Jantzer Heliport | Grants Pass OR |
| OR89 | Kinzua Airport | Kinzua OR |
| OR90 | Lafayette Airstrip Airport | Lafayette OR |
| OR91 | Big Bar Heliport | Homestead OR |
| OR93 | Samaritan North Lincoln Hospital Heliport | Lincoln City OR |
| OR94 | J & J Airport | Brownsville OR |
| OR95 | Vineyard Airport | Mc Coy OR |
| OR96 | Beagle Sky Ranch Airport | Medford OR |
| OR97 | Burrill Airport | Medford OR |
| OR98 | Seneca Emergency Airstrip Airport | Seneca OR |
| OR99 | Rogue Valley Medical Center Heliport | Medford OR |
| ORB | Orr Rgnl Airport | Orr MN |
| ORC | Orange City Muni Airport | Orange City IA |
| ORD | Chicago O'hare Intl Airport | Chicago IL |
| ORE | Orange Muni Airport | Orange MA |
| ORF | Norfolk Intl Airport | Norfolk VA |
| ORG | Orange County Airport | Orange TX |
| ORH | Worcester Rgnl Airport | Worcester MA |
| ORI | Port Lions Airport | Port Lions AK |
| ORK | North Little Rock Muni Airport | North Little Rock AR |
| ORL | Executive Airport | Orlando FL |
| ORS | Orcas Island Airport | Eastsound WA |
| ORT | Northway Airport | Northway AK |
| OSA | Mount Pleasant Rgnl Airport | Mount Pleasant TX |
| OSC | Oscoda-wurtsmith Airport | Oscoda MI |
| OSH | Wittman Rgnl Airport | Oshkosh WI |
| OSU | Ohio State University Airport | Columbus OH |
| OSX | Kosciusko-attala County Airport | Kosciusko MS |
| OTG | Worthington Muni Airport | Worthington MN |
| OTH | Southwest Oregon Rgnl Airport | North Bend OR |
| OTM | Ottumwa Rgnl Airport | Ottumwa IA |
| OTZ | Ralph Wien Memorial Airport | Kotzebue AK |
| OUL | Nelson Lagoon Airport | Nelson Lagoon AK |
| OUN | University Of Oklahoma Westheimer Airport | Norman OK |
| OVE | Oroville Muni Airport | Oroville CA |
| OVL | Olivia Rgnl Airport | Olivia MN |
| OVO | North Vernon Airport | North Vernon IN |
| OVS | Boscobel Airport | Boscobel WI |
| OWA | Owatonna Degner Rgnl Airport | Owatonna MN |
| OWB | Owensboro-daviess County Airport | Owensboro KY |
| OWD | Norwood Memorial Airport | Norwood MA |
| OWI | Ottawa Muni Airport | Ottawa KS |
| OWK | Central Maine Arpt Of Norridgewock Airport | Norridgewock ME |
| OWP | William R. Pogue Muni Airport | Sand Springs OK |
| OWX | Putnam County Airport | Ottawa OH |
| OXB | Ocean City Muni Airport | Ocean City MD |
| OXC | Waterbury-oxford Airport | Oxford CT |
| OXD | Miami University Airport | Oxford OH |
| OXI | Starke County Airport | Knox IN |
| OXR | Oxnard Airport | Oxnard CA |
| OXV | Knoxville Muni Airport | Knoxville IA |
| OYM | St Marys Muni Airport | St Marys PA |
| OZA | Ozona Muni Airport | Ozona TX |
| OZR | Cairns Aaf (fort Rucker) Airport | Fort Rucker/ozark AL |
| OZW | Livingston County Spencer J. Hardy Airport | Howell MI |
