Originally Posted by
eneq
The 737s have the worst air vents in the fleet. You'll always find yourself wanting more air. However, is that worth $200? Unless you're a super heavy-sweater, I would go with the 739 even though they suck.
I agree with this, although on the flip side (not as relevant if you're in F though), the 757s seem to have more insulation / temperature variance issues - especially with exit rows.