Another vote here for the B-17, based purely on an opinion on the tonnage the thing could (or in this case, couldn’t) carry.
‘We can fly a Flying Fortress up to thirty thousand feet
We can fly a Flying Fortress up to thirty thousand feet
We can fly a Flying Fortress up to thirty thousand feet
But we only carry a teeny-weeny bomb!
Glory, glory shall we drop it?
Glory, glory shall we drop it?
Glory, glory shall we drop it?
Shall we drop our teeny-weeny bomb’
(As sung throughout my childhood by my grandad, formerly ground crew of 149 Squadron)