Originally Posted by
MachBrum
A large part of its limit is a function of engine thrust to maintain speed. The 787 runs out of thrust before it does “wing” in a high level climb compared to older types
Depends on the model and outside temp.
787-8 generally tends to be thrust limited, whereas the 787-9 tends to be buffet (wing) limited until ISA+10 and thrust limited at higher temperatures. It may very depending on engine type and thrust rating.