Well, 1st of all the US Airways logo isnt a flag, it's a corporate logo, so it doesnt have to follow any rules. US decided it would be put on that way, so be it. Maybe it saves them money?
The actual flag can either show stars to the left, or as the direction of the aircraft would show it.
If you look at the actual flag on that US plane, you'll see it is correctly showing for direction of movement.
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety.