Actually, they did that to me once, and like a real twit, I offered the miles back and they ignored me. Just trying to cultivate good relations. They, in fact, gave me miles for two different flights departing in diametrically opposite directions, while I took off in a third, straight up (as the compass goes) direction. Odd, really, because my itinerary was fixed. So, I didn't claim the miles for the flight actually flown.