Is Plane lighter going west than going east?

[Vmu]

Another effect that gets way too little attention during ground school is the momentum of photons from the sun; I would expect total drag to be slightly higher when flying into sun, than away from it. When I think about it the drag would also be higher with the sun above the A/C, as the wings would have to produce more lift and hence operate at a (slightly) higher AoA.