Hi-Lock,
According to the skeds on SABRE, the following applies:
757 : single-aisle (vicious on a flight of 4 hours or more)
F-22 / Y-154
767-300: dual-aisle (much more comfy trans-con)
F-9 or 10 depending on crewrest seats
C-24 (soon to be all 30 C-class ala Delta)
Y-152-156 (depending on crewrest seats)
Honestly, C-class on a 767 is more comfortable than F-class on a 757. 737's do transcons out of BOS and JFK. Dual-aisle is more psychologically comforting than single-aisle (even on all-nighters). Just my 2 bits.
I love hearing the MNTC P.O.V. F/A's don't understand the after-effects of pouring juice or milk down the drain...I do. I stay out of your way and always offer you something to drink. 😉 We are all in this together! Thanks for keeping us safe in the skies!
love,
Coop