MY FAVS:
Coach: 777
Business: 747-400 upstairs (I'll be trying the 747-200 upstairs for the 1st time next week ORD-LAX...)
First: on a 3-class plane? Yeah, right, keep dreamin'...

My UNFAVS:
J41 (prefer the smaller J31s)
DC10 (unless it happens to be UA flight 57 )

The rest are just plane planes to me...