Originally Posted by
N590UA
Does it really outperform the 321 or is that your opinion? The 739ER is a pig on takeoff compared to the 757. Much like the MAX, that frame has been stretched way too far over a long period of time.
The 739 sits quite a few feet lower to the ground than the 757, hence the shallower takeoffs. A pig on takeoff are aircraft that struggle to get off the ground due to lack of power (cue some of the older western/russian planes); the 739 is constricted by height not power, thus not making it a pig.
The 739 and 321 are practically equal all things considered. It is true, a lot of airlines tend to favor the 9 on long routes and that might be a combination of lower weight and fuel burn.