| Abbreviation | Definition |
|---|---|
| QBU | Quick Back-Up |
| QBV | Have you reached the .... height above .... ? |
| QC | Quad Cab |
| QC | Quiet Compact |
| QCE | Quick Carrier Express |
| QCP | Quality Control Program |
| QCV | Questionable Crankcase Ventilation |
| QDL | Do you intend to ask me for a series of bearings? |
| QDT | Are you flying in VFR weather conditions? |
| QDU | IFR flight cancelled at ... (time) |
| QDV | Are you flying in a horizontal visibility of less than ...? |
| QEA | May I cross the runway ahead of you? |
| QEB | May I turn at the intersection? |
| QEC | May I make a 180-degree turn and return down the runway? |
| QEC | Quicksilver Express Courier |
| QEC | Quicktube Exhaust Cutout |
| QED | Shall I follow the pilot vehicle? |
| QEF | Have I reached my parking area? |
| QEG | May I leave the parking area? |
| QEH | May I move to the holding position for runway number ... ? |