Boeing Aircraft Co customer codes

If y'll  always wondered where the number behind the airplane model number is:    I mentioned the 707 mentioned in the origional airplane movie was a Boeing 707 348C   means that the airplane was a 707 300 series airplane and the 48 was the build customer for that airplane.  Looking at our trusty list below, the launch customer was AER LINGUShttp://en.wikipedia.org/wiki/Aer_Lingus

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:

• 21 to 99 - First Sequence
• 01 to 19 - Second Sequence
• A0 to Z9 - Third Sequence
• 0A to 9Z - Fourth Sequence
• AA to ZZ - Fifth and current sequence

Airlines in italics are defunct.

Code	Customer	Notes
01	Piedmont Airlines	737, 767
02	Northern Consolidated Airlines	737
03	Caribair (Caribbean Atlantic Airlines)	Not used
04	Britannia Airways → Thomson Airways	737, 757, 767
05	Braathens SAFE → Braathens	737, 767
06	KLM	737, 747, 767, 777
07	Luftwaffe	707
08	Icelandair	727, 737, 757
09	China Airlines	707, 727, 737, 747, 767
10	Wien Consolidated → Wien Air Alaska	737
11	Wardair	707, 727, 747
12	Malaysia-Singapore Airlines → Singapore Airlines	707, 727, 737, 747, 757, 777
13	Ariana Afghan Airlines	727
14	Pacific Southwest Airlines	727, 737
15	Lake Central Airlines	Not used
16	LAN Airlines	707, 727, 767, 777
17	Canadian Pacific Air Lines	727, 737, 747, 767
18	British European Airways	Not used
19	New Zealand National Airways Corporation → Air New Zealand	737, 747, 767, 777
20	Boeing
21	Pan American World Airways	707, 720B, 727, 747
22	United Airlines	720, 727, 737, 747, 757, 767, 777
23	American Airlines	707, 720, 727, 737, 747, 757, 767, 777
24	Continental Airlines	707, 720, 727, 737, 747, 757, 767, 777
25	Eastern Air Lines	720, 727, 757
26	United States Air Force (USAF) - Military Air Transport Service (MATS)	C-137
27	Braniff	707, 720, 727, 747
28	Air France	707, 727, 737, 747, 767, 777
29	Sabena/Brussels Airlines	707, 727, 737, 747
30	Deutsche Lufthansa/Condor	707, 720, 727, 737, 747, 757, 767
31	Trans World Airlines	707, 717, 727, 747, 757, 767
32	Delta Air Lines	727, 737, 747, 757, 767, 777
33	Air Canada	727, 747, 767, 777
34	Transair Sweden	727
35	National Airlines	727, 747
36	BOAC → British Airways	707, 737, 747, 757, 767, 777
37	Air India	707, 737, 747, 777
38	Qantas	707, 737, 747, 767
39	Cubana	707 (not del)
40	Pakistan International Airlines	707, 720, 737, 747, 777
41	Varig Brazilian Airlines	707, 727, 737, 747, 767
42	Nordair	727, 737
43	Alitalia	727, 747, 767, 777
44	South African Airways	707, 727, 737, 747
45	Seaboard World Airlines	707, 747
46	Japan Airlines (JAL)	727, 737, 747, 767, 777, 787
47	Western Airlines	707, 720, 727, 737
48	Aer Lingus	707, 720, 737, 747
49	Flying Tiger Line	707, 747
50	Trek Airways
51	Northwest Orient Airlines → Northwest Airlines	707, 720, 727, 747, 757
52	Aeromexico	737, 767
53	United States Air Force	707 (C-137), 737 (T-43)
		More at this linkhttp://en.wikipedia.org/wiki/List_of_Boeing_customer_codes