But the total distance the plane travels is a given, and so is the speed it travels. The actual cities it comes and goes to shouldn't matter in this case ?!?
EDIT: I admit, it is overly simplified... especially when you check the actual distances involved... and the fact half the answers here don't correspond with ours (we've got the same one) means there's uncertainty on that front.
RE: #steemitriddlechallenge EDITION 1 - riddle #6