The nose number is the most important number on your plane (apart from your seat number, unless it's 44E ). It shows you the configuration of your bird before you get on board....

For example, wanna know if that ratty 737 sitting at the gate is an ex-sh*ttle plane? (thank god, this will soon be history!), look for:

737-300's: 10xx, 13xx
737-500's: 97xx

And yes, the 777's have multiple configurations:

23xx - 777A, 3 class
25xx - 777A, 2 class
26xx - 777B, 3 class, C+, Y+ (10F)
27xx - 777B, 3 class, C+ (12F)
28xx - 777B, 3 class, C+, (10F)
29xx - 777B, 3 class, C+, Y+ (12F)

etc etc



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RichardMEL, UA 1K
A Star Alliance Member.