| ALASKA | DUT | UNALASKA |
| ALASKA | DUY | KONGIGANAK |
| ARIZONA | DUG | DOUGLAS BISBEE BISBEE DOUGLAS INTL |
| MICHIGAN | DUH | LAMBERTVILLE TOLEDO SUBURBAN |
| OKLAHOMA | DUA | DURANT EAKER FLD |
| OKLAHOMA | DUC | DUNCAN HALLIBURTON FLD |
| PENNSYLVANIA | DUJ | DU BOIS-JEFFERSON CO |
| TEXAS | DUX | DUMAS MOORE CO |