Digunakan untuk mengenalpasti penerbangan-penerbangan yang menggunakan pesawat Boeing. Contohnya untuk Boeing 747-400 United Airlines : 747-422

• 00: Boeing
• 01: Piedmont Airlines → US Air → US Airways
• 02: Northern Consolidated Airlines → Wien Air Alaska
• 03: Caribair (Caribbean Atlantic Airlines)
• 04: Britannia Airways → Thomsonfly
• 05: Braathens SAFE → Braathens
• 06: KLM
• 07: Luftwaffe
• 08: Icelandair
• 09: China Airlines
• 10: Wien Consolidated → Wien Air Alaska
• 11: Wardair
• 12: Singapore Airlines
• 13: Ariana - Afghan Airlines
• 14: Pacific Southwest Airlines
• 15: Lake Central Airlines
• 16: LAN Chile
• 17: Canadian Pacific Air Lines
• 18: British European Airways
• 19: Air New Zealand
• 1A: Martinair Holland
• 1B: China Southern Airlines
• 1C: Government of Romania
• 1H: Emirates
• 1K: Airtours International Airways
• 1L: Xinjiang Airlines
• 1M: Oman Air
• 1Q: Tombo Aviation
• 1R: Virgin Atlantic Airways
• 1S: Deutsche BA → dba
• 1U: BBJ Customer
• 20: Boeing
• 21: Pan American Airways
• 22: United Airlines
• 23: American Airlines
• 24: Continental Airlines
• 25: Eastern Airlines
• 26: United States Air Force (USAF) Military Airlife Transport Service (MATS)
• 27: Braniff
• 28: Air France
• 29: Sabena
• 30: Deutsche Lufthansa
• 31: TWA
• 32: Delta Air Lines
• 33: Air Canada
• 34: Transair Sweden
• 35: National Airlines
• 36: BOAC → British Airways
• 37: Air India
• 38: Qantas
• 39: Cubana
• 3V: easyJet Airline Company
• 40: Pakistan International Airlines
• 41: Varig Brazilian Airlines
• 43: Alitalia
• 44: South African Airways
• 45: Seaboard World Airlines
• 46: Japan Airlines (JAL)
• 47: Western Airlines
• 48: Aer Lingus
• 4A: United Parcel Service
• 50:
• 51: Northwest Airlines
• 53: United States Air Force
• 56: Iberia
• 57: Swissair
• 58: El Al
• 59: Avianca
• 5E: Eva Air
• 5S: CSA Czech Airlines
• 60:
• 64: Mexicana
• 66: Egyptair
• 67: Cathay Pacific Airways
• 68: Saudi Arabian Airlines
• 69: Kuwait Airways
• 6K: Vietnam Airlines
• 6N: GECAS
• 70: Iraqi Airways
• 71:
• 73: World Airways
• 75: Pacific Western → Canadian Airlines
• 76: Trans Australia Airlines
• 77: Ansett
• 7C: Japanese Self Defence Force
• 80:
• 81: All Nippon Airways
• 82: TAP Portugal
• 83: SAS
• 84: Olympic Airways
• 87: Aerolíneas Argentinas
• 89: Japan Air System → Japan Airlines Domestic
• 8E: Asiana Airlines
• 90: Alaska Airlines
• 91: Frontier Airlines
• 95: Northeast Airlines
• 99: British Caledonian
• A1: VASP
• AS: Ryanair
• B5: Korean Air
• C9: Luxair
• D7: Thai Airways International
• F2: Turkish Airlines
• F6: Philippine Airlines
• FE: Virgin Blue
• H4: Southwest Airlines
• H6: Malaysia Airlines
• J6: Civil Aviation Administration of China
• K2: Transavia
• K5: Hapag-Lloyd Airlines
• L9: Maersk Air
• Q3: Southwest Air Lines Japan, → Japan Transocean Air
• Q4: Trans Brasil
• Q8: ILFC
• R7: China Airlines
• S2: Federal Express
• S3: Air Europe
• T4: Air Florida
• U3: Garuda Indonesia
• Z9: Lauda Air