...........the engine makes a lot of noise. This noise attracts any Lift Pixies in the area and they jump on the wing thus creating lift and raising the aircraft into the air.
Arty’s got it Spot On.
In fact, with the right conditions and a Pixie filter, you can photograph Lift Pixies.
They don’t like it – but you can; they're only little.
PS. What Arty didn't mention, and perhaps should have done, is thrust reversers.
They're there to blow the Lift Pixies off the wing.