| Regional Airlines | |
| Air Wisconsin | Mesa |
| CommutAir | Piedmont |
| Endeavor | PSA |
| Envoy | Republic |
| GoJet | SkyWest |
| Horizon | |
| Failed or Merged Regional Airlines | |
| Atlantic Coast Airlines | Mesaba |
| Atlantic Southeast Airlines | Mid Atlantic |
| Comair | Pinnacle |
| Chautauqua | Shuttle America |
| Compass | Skyway |
| ExpressJet | TransStates |
| Older Failed or Merged Airlines | |
| Aspen Airways | PenAir |
| Altair | Pilgrim Airlines |
| Empire Airlines | Presidential Airways |
