| ALASKA | ORT | NORTHWAY |
| ALASKA | ORI | PORT LIONS |
| ARKANSAS | ORK | NORTH LITTLE ROCK MUNI |
| FLORIDA | ORL | ORLANDO EXECUTIVE |
| ILLINOIS | ORD | CHICAGO OHARE INTL |
| IOWA | ORC | ORANGE CITY MUNI |
| MASSACHUSETTS | ORE | ORANGE MUNI |
| MASSACHUSETTS | ORH | WORCESTER RGNL |
| MINNESOTA | ORB | ORR RGNL |
| TEXAS | ORG | ORANGE CO |
| VIRGINIA | ORF | NORFOLK INTL |
| WASHINGTON | ORS | EASTSOUND ORCAS ISLAND |