Originally Posted by BayAreaPilot
Online check-in or not, it's easy enough to "lose" your boarding pass and get it reprinted.
But if the operating carrier receives two, one from UA and one from, say, LH, they will know somehting is up.
I'm not defending the idea, I think it is stupid too, but thats the way it is. Play the game and take the miles ... or leave them.