Definition from Wiktionary, the free dictionary
A-1 (not comparable)
- Alternative spelling of A1.
A-1 (plural A-1s)
- (US, military, historical) Cox-Klemin A-1 Air Ambulance, never mass produced.
- (US, military) Skyraider single engine general-purpose attack aircraft.
- (US, military) Personnel section of an air force staff.
- (military) Air personnel officer.