| Z2 | CYN | Zhong Yuan Airlines | |
| Z2 | STY | 536 | Styrian Airlines |
| Z3 | STW | 913 | Star Airways |
| Z3 | SMJ | 757 | Avient Aviation |
| Z5 | GMG | 009 | GMG Airlines |
| Z6 | UDN | 181 | Dniproavia Joint Stock Aviation Company |
| Z7 | EZX | 247 | Zimbabwe Express Airlines |
| Z7 | ADK | ADC Airlines | |
| Z9 | RZL | 509 | Aero Zambia |
| ZA | ZAS | ZAS Airline of Egypt | |
| ZB | MON | 974 | Monarch Airlines |
| ZC | RSN | 141 | Royal Swazi National Airways |
| ZD | DDD | AirNet 21 JSC | |
| ZE | AZE | Arcus Air Logistic | |
| ZE | LCD | 994 | Lineas Aereas Azteca |
| ZF | MIW | Airborne | |
| ZG | VVM | Viva Macau | |
| ZH | TRK | 507 | Air Truck |
| ZI | AAF | Aigle Azur Transport Aériens | |
| ZJ | ARC | Air Routing International Corporation | |
| ZK | GLA | 846 | Great Lakes Aviation Ltd |
| ZL | AFM | 292 | Affretair |
| ZL | HZL | 899 | Regional Express |
| ZM | SBZ | 939 | Scibe Airlift |
| ZN | EAV | 528 | Eagle Airlines |
| ZP | STT | 315 | Air St Thomas |
| ZP | AZQ | 463 | Silk Way Airlines |
| ZQ | NZA | 941 | Ansett New Zealand |
| ZR | MUK | 796 | Muk Air |
| ZR | AZS | 410 | Aviacon Zitotrans |
| ZS | AZI | 864 | Azzurra Air |
| ZT | NSE | Satena | |
| ZT | AWC | Titan Airways | |
| ZU | HCY | 032 | Helios Airways |
| ZU | AKC | 158 | ARCA Aerovias Colombianas |
| ZV | AMW | 471 | Air Midwest |
| ZW | AWI | 303 | Air Wisconsin Airlines |
| ZX | ABL | Air BC | |
| ZX | GGN | Air Georgian/Georgian Express | |
| ZY | ADE | 121 | Ada Air |