Originally Posted by
AusEuroFlyer
I think you've just ended up answering your own question there...
The cold-weather manufacturer hypothesis would be a reasonable one to draw unless/except 1) deHavilland Canada/Boeing/Bombardier has been remarkably lucky, 2) one would expect a Swedish a/c mfg to design for cold weather ops too (unless Fairchild had too much of a say).
Heat also poses quite a bit of issues to some turboprops. Some turboprops just don't have much spare performance to accommodate a wide range of situations.
I imagine you're referring to the SAAB Fairchilds run by one of the AA regionals out of LAX and vicinity which has frequent weight restrictions?