His eyes grew large when he looked at the screen and he said "FRA-DFW-LAS-LAX-BOS, that's a little out of the way!" Looking him in the eye I replied "I need the miles." I wonder what he would have said if I tole him that Iwill be turning around when I arrive in BOS and doing a RT transcon tommorrow.
It's no big deal. The AA staff at FRA are
very accustomed to MRs. Last weekend, I was there on a quick-turn MR, and the security agent who does the pre-checkin baggage security questions swiped my MRZ, saw my itinerary on the laptop screen, and immediately said, "So, you are flying for the miles, correct?" with a smile on her face.
One suggestion: if you are a U.S. Citizen/Permanent Resident and plan to do a lot of international MRs, consider joining
GlobalEntry. It will save you hours standing in passport control lines, and it also will eliminate the need to explain the MRs to the officers under most circumstances.