737-300
10XX
98XX
99XX

737-500
15XX
16XX

A319
40XX

A320
45XX Overwater Ted
46XX
47XX Overwater
48XX Ted
49XX Ted

757-200
54XX
55XX overwater ETOPS
56XX overwater
57XX premium service

767-300
63XX
67XX 2 cabin

777-200
23XX
25XX 2 cabin
26XX pacific
28XX
29XX

747-400
81XX

The "XX" can be found in the reg number. The reg number will always start with "N" and end in "UA". So from the post above, if you have a 757, which will have a reg code that starts with 5, and the nose number is 5440, then the reg number will be N540UA. That link above is really nice, and has a ton of good info in it. Unfortunately, it does not have nose numbers, but with my info and the other info posted here, you can figure it out. I have found this info out on this internet before as well, and even logic behind other airlines' reg numbers.

Question: on the link above, what does the column "SELCAL" mean?