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Unique, fixed Boeing customer codes have been used by Boeing Commercial Airplanes to identify the original customer for an aircraft since the advent of the Boeing 707.

An example would be a Boeing 747-400 ordered by British Airways would be a Boeing 747-436 (36 being the customer code). The codes do not change if the aircraft is subsequently sold as they reflect the original configuration of the aircraft.

Before the 707, Boeing used a generally similar system to identify the presence of detailed variations or options requested by particular customers, but the codes were not customer-specific. A Boeing 377 Stratocruiser built to the requirements of United Air Lines, for instance, was designated a Model 377-10-34. Today, the permanent code denoting United Airlines is 22, not 34.

The order of codes has not been sequential, as the first 707 was designated the 707-120 by Boeing, so the customer codes started at 21:

The system was first introduced by Boeing in the 1950s with production of the 707. The launch customer of the 707 was Pan Am, and the specific model they had purchased was the 707-120, the initial production version. Thus, the Pan Am aircraft became the 707-121 and Pan Am's numeric designation became 21 (20 represented Boeing itself). The pattern continued with new customers receiving subsequent numbers from 22 to 99. Once 99 had been reached, additional customers received the earlier numbers of 01 to 19. After exhausting the two digit designations, Boeing introduced an alphanumeric system consisting of one letter and one number ranging from A0 to A9, B0 to B9, and so on. This system was also expanded by reversing the order and creating additional codes ranging from 1A to 9A, 1B to 2B, etc. The most recent expansion of the system includes the use of double letters that don't appear to follow any set pattern.

The following list helps to decipher the original customer of any Boeing commercial aircraft built since the early 1950s. For example, a 737-5H4 is a 737-500 bought by Southwest Airlines while a 747-436 is a 747-400 built for British Airways. The codes remain even if the specific airplane has since been sold to another airline, such as a 757-225 originally built for defunct Eastern Airlines but now operated by Airtours. Note that the list also includes buyers of the Boeing Business Jet (BBJ) who are typically corporate operators and not airlines.

21 to 99 - First Sequence






Pan American World Airways (Pan Am)


United Airlines


American Airlines


Continental Airlines


Eastern Air Lines


US Air Force - Military Air Transport Service


Braniff International Airways


Air France


Sabena/Brussels Airlines


Deutsche Lufthansa/Condor


Trans World Airlines (TWA)


Delta Air Lines

33 Air Canada
34 Transair Sweden
35 National Airlines
36 BOAC → British Airways
37 Air India
38 Qantas
39 Cubana
40 Pakistan International Airlines (PIA)
41 Varig Brazilian Airlines
42 Nordair
43 Alitalia


South African Airways
45 Seaboard World
46 Japan Airlines (JAL)
47 Western Airlines
48 Aer Lingus
49 Flying Tiger Line
50 Trek Airways
51 Northwest Orient Airlines → Northwest Airlines
52 AeroMéxico
53 US Air Force
54 Mohawk Airlines
55 Executive Jet Management
56 Iberia
57 Swissair/Swiss International Air Lines
58 EL AL - Israel Airlines
59 Avianca
60 Ethiopian Airlines
61 Federal Aviation Administration (FAA)
62 Pacific Northern Airlines
63 Faucett Perú
64 Mexicana
65 Cunard Eagle/British Eagle
66 United Arab Airlines → Egyptair
67 Cathay Pacific Airways
68 Saudia → Saudi Arabian Airlines
69 Kuwait Airways
70 Iraqi Airways
71 Trans International Airlines → TransAmerica
72 Airlift International
73 World Airways
75 Pacific Western → Canadian Airlines
76 Trans Australia Airlines → Australian Airlines
77 Ansett Australia
78 British West Indies Airways (BWIA)
79 Saturn Airways
80 Bankers Trust
81 All Nippon Airways (ANA)
82 TAP Air Portugal → TAP Portugal
83 Scandinavian Airlines System (SAS)
84 Olympic Airways
85 American Flyers
86 Iran Air
87 Aerolíneas Argentinas
88 Middle East Airlines/Aerotechnik Deutsche Charter
89 Japan Domestic Airlines → Japan Air System (JAS) → JAL Domestic
90 Alaska Airlines
91 Frontier Airlines
92 Southern Air Transport
93 Pacific Air Lines
94 Syrian Arab Airlines
95 Northeast Airlines
96 Quebecair → Nordair
97 Aloha Airlines
98 Air Zaïre
99 Caledonian Airways

01 to 19 - Second Sequence




Piedmont Airlines


Northern Consolidated Airlines
04 Britannia Airways → Thomson Airways
05 Braathens SAFE → Braathens


KLM Royal Dutch Airlines


08 Icelandair
09 China Airlines
10 Wien Consolidated → Wien Air Alaska
11 Wardair Canada
12 Malaysia-Singapore Airlines → Singapore Airlines
13 Ariana Afghan Airlines
14 Pacific Southwest Airlines
16 LAN Airlines
17 Canadian Pacific Air Lines
19 New Zealand National Airways Corp. (NAC) → Air New Zealand

A0 to Z9 - Third Sequence




LAB Lloyd Aéreo Boliviano


A3 PLUNA Líneas Aéreas Uruguayas
A4 AirCal
A6 Essex International/LTV Capital
A7 Trans Caribbean Airways
A8 Indian Airlines
A9 Transair
B0 China Cargo Airlines
B1 DETA Mozambique/Linhas Aéreas de Moçambique
B2 Air Madagascar
B3 Union des Transports Aériens (UTA)
B4 Middle East Airlines (MEA)
B5 Korean Air
B6 Royal Air Maroc
B7 Allegheny Airlines → USAir → US Airways
B8 Austrian Airlines
C0 GATX/Boothe
C3 Cruzeiro
C9 Luxair
D1 Universal Airlines
D3 Royal Jordanian Airlines
D4 Ozark Air Lines
D6 Air Algérie
D7 Thai Airways International
E0 Dubai Air Wing
E1 Eastern Provincial Airways
E3 Ladeco
E7 Arkia
F2 Turkish Airlines
F5 Government of Portugal/Portugal Air Force
F6 Philippine Airlines
F8 Royal Nepal Airlines → Nepal Airlines
F9 Nigeria Airways
G1 Government of Saudi Arabia
G4 US Air Force
G5 L.T.S/LTU International
G7 America West Airlines
H2 ITT Corp.
H3 Tunisair
H4 Southwest Airlines
H5 Mey-Air
H6 Malaysia Airlines
H7 Cameroon Airlines
H9 JAT Airways
J0 Air Jamaica
J1 Dominicana
J4 Sterling Airways
J6 CAAC → Air China
J7 National Aircraft Leasing
J8 Sudan Airways
J9 Iran Air Force
K1 TAROM/Government of Romania
K2 Transavia/KLM
K3 Aviogenex
K5 Hapag-Lloyd
K6 SAHSA Airlines
K9 Bavaria Flug
L4 American Capital Aviation
L5 Libyan Arab Airlines
L6 Aviation Services & Support
L7 Air Nauru
L8 Government of Yugoslavia
L9 Maersk Air
M0 Aeroflot
M1 Pelita Air Service
M2 TAAG Angola Airlines
M6 Royal Brunei Airlines
M7 Hughes Airwest
M8 Trans European Airways (TEA)
M9 Zambia Airways
N0 Air Zimbabwe
N1 Government of Venezuela
N3 Government of Brazil
N6 Government of Nigeria
N7 Government of Egypt
N8 Yemen Airways
N9 Government of Niger/Air Niger
P1 Government of Qatar
P3 HRH Talal bin Abdul Aziz
P5 Thai Airways
P6 Gulf Air
P8 Bahrain Amiri Flight
Q2 Air Gabon
Q3 Southwest Air Lines → Japan Transocean Air
Q4 Transbrasil
Q5 Government of Liberia/Air Liberia
Q9 Itel Corp.
R1 Government of Cameroon
R4 Alyemda
R6 Air Guinée
R8 Air Tanzania
S1 TACA International Airlines
S2 Federal Express (FedEx)
S3 Air Europe
S4 Air Afrique
S5 Eldorado Aviation
S7 North Central Airlines/Republic Airlines
S9 Maritime Investment
T0 Texas Air Corporation/Continental Airlines
T2 Dome Petroleum
T3 Evergreen
T4 Air Florida
T5 Orion Airways
T7 Monarch Airlines
T8 Polaris Leasing
T9 Boeing
U3 Garuda Indonesian Airways → Garuda Indonesia
U4 OSL Villa Holidays
U5 Government of Jordan
U8 Kenya Airways
U9 Polynesian Airlines
V3 Copa Airlines
V5 Bahamasair
V6 Petrolair Systems SA
V8 Air Executive/Busy Bee
W0 China Yunnan Airlines
W2 Aerotour
W6 Government of Morocco
W8 NOGA Import
X2 Air Pacific
X3 Air Charter International
X4 Supair
X6 Markair
X8 Wistair
X9 Indonesian Air Force
Y0 Guinness Peat Aviation
Y4 Rafik Hariri
Y5 Air Malta
Y9 Air Malawi
Z0 China Southwest Airlines
Z5 United Arab Emirates Royal Flight
Z6 Royal Thai Air Force
Z8 South Korean Air Force
Z9 Lauda Air

1A to 9Z - Fourth Sequence




Martinair Holland → Martinair


China Southern Airlines
1C Government of Romania
1H Emirates
1K Airtours International Airways
1L Xinjiang Airlines → China Xinjiang Airlines
1M Oman Air
1Q Tombo Aviation
1R Virgin Atlantic Airways
1S Deutsche BA → DBA
2A Hawaiian Airlines
2C Air UK Leisure
2J Arab Leasing
2K Turkmenistan Airlines/Akhal
2L Azerbaijan Airlines
2P Government of United Arab Emirates
2Q Ukraine International Airlines
2R Pegasus Airlines
2T Tracinda Corporation
2U JABJ / Picton II Ltd.
2W TAM Brazilian Airlines
3A Ansett Worldwide (AWWAS)/Nordstress Ltd.
3B Air Mauritius
3C Euralair International
3N American Trans Air → ATA Airlines
3P Uzbekistan Airways
3Q BCC Equipment Leasing Corp.
3R Western Pacific Airlines
3S Pembroke Capital
3T Real Estate Exchange
3U Chartwell Aircraft Company/Chartwell Partners LLC
3V easyJet Airline Company
4A United Parcel Service (UPS)
4K Air Nippon
4N China United Airlines
4P Hainan Airlines
4Q Mid East Jet
4S GB Airways
4T North Pacific Aviation
4U Air Shamrock
4V Superior International Aviation Services
4X Sky Airlines
5A Presidential Airways
5B Germania
5C Xiamen Airlines
5D LOT Polish Airlines
5E EVA Air
5F GATX Capital Corporation
5G MGM Mirage → MGM Resorts International
5H Itochu AirLease Corporation
5N Shandong Airlines
5P Air Europa
5R Jet Airways
5S CSA Czech Airlines
5T First Union Commercial Corp.
5U Dobro Ltd.
5V General Electric Corp.
6B Cal Air/Novair International Airways
6D Shanghai Airlines
6J Air Berlin
6K Vietnam Airlines
6M Eurobelgium Airlines → Virgin Express
6Q Boullion Aircraft Holding
6R Wuhan Airlines
7A Far Eastern Air Transport (FAT)
7B Air Holland
7C Japan Air Force
7D Air Seychelles
7E Aeromaritime International
7G Malév Hungarian Airlines
7K Zhongyuan Airlines
7L Shenzhen Airlines
7Q Novel Leasing Company
7U Atlas Air
8A Air 2000 Limited → First Choice Airways
8B Istanbul Airlines
8E Asiana Airlines
8N Chile Air Force
8S China Xinjiang Airlines
9B Government of Brunei
9D Linjeflyg
9H Leisure International Airways
9J Shorouk Air
9K Shenzhen Airlines
9L Air China
9M Air Austral
9N Mid East Jet
9P China Eastern Airlines
9R Pro Air
9T Usal Ltd.
9U Wilmot Trust company

AA to ZZ - Fifth Sequence




AB Airlines

AD Eastwind Airlines
AF US Navy
AH General Electric Capital Corp.
AJ Government of Saudi Arabia
AK PrivatAir
AL Singapore Aircraft Leasing Enterprise
AN Saudi Oger Ltd.
AR Taiwan Air Force
AS Ryanair
AU Aircraft Guaranty Title Corp.
AV Newsflight II Inc.
AW A.S. Bugshan & Bros.
AX Saudi Aramco
BC Boeing NetJets
BD AirTran Airways
BF Funair Corp.
BG Flightlease AG → GATX Jet Partners Ltd.
BH TBN Aircraft Corp.
BJ Atlas Air
BK CIT Leasing Corp.
BL Midwest Airlines
BS North American Airlines
BX Midway Airlines
CB BCC Equipment Leasing Corp.
CG GKW Aviation LLC
CJ BBJ One Incorp.
CM Aerolíneas de Baleares Aebal
CN Matela Offshore Limited
CP Ford Motor Company
CQ JMC Airlines Ltd.
CT WestJet
CU Tutor-Saliba Corp.
CX GATX - Flightlease
DC Miami Air International
DF Royal Australian Air Force
DM US Air Force
DP Royal Saudi Air Force
DR Multiflight
DT Qantas Defence Services/Royal Australian Air Force
DV Lowa Ltd.
DW Bausch & Lomb Inc.
DX Kazakhstan Airlines
DZ Qatar Airways
EA Líneas Aéreas Azteca
EC Dubai Air Wing
ED South African Air Force
EE Air Sénégal International
EF Mid East Jet
EG Samsung Aerospace
EH Gol Transportes Aéreos
EJ Grupo Omnilife S.A. de C.V.
EL Swiflite Aircraft Corp.
EM LUK Aviation
EQ EIE Eagle Inc.
ES Royal Australian Air Force
ET Unknown
EV Jade Cargo International
EX Amiri Flight Line
EY Italy Air Force
FB Government of Equatorial Guinea
FD BCC Equipment LLC
FE Virgin Australia Airlines

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