As a regular spotter at SDF
, I see UPS A300's depart all the time and have noticed that they often takeoff with their flaps up (although their leading-edge slats appear to be down, and a section of inboard flaps right behind the engines are down). I've also noticed the same thing in photos/videos with the Fokker 100. Does anyone know why they can takeoff with the flaps up? Is it due to the efficient A300 wing? Also, I've noticed that A300's also takeoff with their flaps down sometimes; for example, FX
seems to always use flaps on takeoff, sometimes AA
. But why do they only put the flaps down for takeoff occasionally?