Originally Posted by
Ty Vil
A loaded up 737 will take off and requires "step climb" to cruising altitude as it doesn't have the power to weight ratio for continuous climb.
https://en.wikipedia.org/wiki/Step_climb
The 757 can climb all the way to cruise altitude without any leveling off.
What model 737 at what weight to what cruise altitude? Your post above is very general and often incorrect. I was referring to another poster who seemed to think "step climb" meant the reduction from takeoff thrust soon after departure. It doesn't.
Here's one recent example of a 737 that took off and went right up to FL380 in 20 minutes:
https://flightaware.com/live/flight/.../KDEN/tracklog
And a 757 that leveled off at FL320 (about 12 minutes time to climb) before climbing to FL400 though it's entirely possible the level off at FL320 was an ATC restriction for traffic. They only stayed at FL320 for about 17 minutes:
https://flightaware.com/live/flight/.../KSFO/tracklog