# How to correct these garbled tail numbers?

I have a collection of tail numbers of US aircraft which flew a bunch of domestic flights in the 2000's, but some of them seem to end with @ or @@, or @@@, which are obviously not a valid tail number characters. My question is - are these prefixes of tail numbers with the last character/digit removed? Or are these valid tail numbers if we just drop the @'s?

Examples:

N71@@@
N9346@
N93@@@
N795@@
N796@@
N797@@
N400@@
N401@@
N402@@
N403@@
N3744@
N405@@
N406@@
N404@@
N407@@
N3753@
N3752@
N3756@
N408@@
N409@@
N411@@
N3759@
N3765@
N3766@
N3767@
N3768@
N410@@
N412@@
N413@@
N414@@

Now, I could go look up these numbers in the registry. But - that would look up current data, while I need data from 2001 and 2002. Today, some of these numbers (when dropping the @'s) are registered to private individuals, some to non-airline companies, and some aren't registered at all.

Note: The carriers owning these specific numbers in the list above were Southwest Airlines and Delta Airlines.

• Please don't use codeblocks for text that is not code. You could easily list these separated by commas, in a table, or with listing; it only makes illegible the symbols in the sentences. – Nij Jan 30 at 12:11