Originally Posted by
Ottopilot
Only UAL calls 737's guppies. I'm not sure why. The -500 looks like one, but the other 200 planes don't. I had a little A319 call my -900ER a guppy in SFO.
I never understood "guppy" to used in derogatory sense at UAL, rather as a term of endearment - a habit that will die hard hopefully.