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AA Registration Classification  
User currently offlineQANTAS747-438 From United States of America, joined Jan 2001, 2076 posts, RR: 2
Posted (13 years 10 months 2 weeks 5 days 14 hours ago) and read 1339 times:

What's the deal with AA tail and aircraft classifications? Why would an AA 757 with registration N352AN be classified as "aircraft 5EK"? I've also seen the "N" number end in AA and AM. Where did the AN and AM come from, and what do 5EK or 6TG or 3A0 mean?


My posts/replies are strictly my opinion and not that of any company, organization, or Southwest Airlines.
4 replies: All unread, jump to last
User currently offlineBR715-A1-30 From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 10 months 2 weeks 5 days 8 hours ago) and read 1322 times:

That is weird, I have also seen this on the F100s... Like one would be 1CE. What is the meaning of this ::Shrugs::?

User currently offlineDavid_itl From United Kingdom, joined Jun 2001, 7811 posts, RR: 13
Reply 2, posted (13 years 10 months 2 weeks 5 days 8 hours ago) and read 1316 times:
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The alphanumeric code is probably a maintenance reference number/internal code for a given aircraft, with "5" indicating 757s, "1" for Fk100s, etc with the two letters going in sequence with the order in which they received the aircraft.

The different endings for the registration may be down to the fact that "AA"-ending registrations aren't available and they have to locate free registration blocks. (Probably the (last) three figures are consecutive.)


User currently offlineJustplanesmart From United States of America, joined Mar 2001, 731 posts, RR: 2
Reply 3, posted (13 years 10 months 2 weeks 4 days 20 hours ago) and read 1275 times:

If you do the math, a fleet number that is just 3 numerals allows for only one hundred aircraft with the first digit pre-determined-e. g. "5" for the 757, "3" for the 737, etc. However, allowing the second and third digit to be letters instead increases this significantly. American has avoided using "I", "O", "Q", and "Z", presumably to avoid being confused with numbers "1", "0", and "2". But this still allows 22*22 = 484 possibilities. As the airline might very well have more that 100 of certain types, this allows them all to be under the same numbering system. It has also allowed the former TWA MD-80 and 757 fleets to be put under the same system, starting with "4TA" and "5TA" respectively.

"So many planes; so little time..."
User currently offlineIahcsr From United States of America, joined Jun 1999, 3767 posts, RR: 40
Reply 4, posted (13 years 10 months 2 weeks 4 days 20 hours ago) and read 1269 times:
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Justplanesmart is JustPlainRight in this case. AA chose to use this method of fleet I.D. to avoid the need to change over to a four digit system. (Such as DL has done with the 777)

Working very hard to Fly Right....
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