Another question related to the original: Is there any disadvantage to getting a round trip ticket with Delta BOS-FCO-BOS and NOT fly the return leg of that ticket (cancel it after flying the first leg). We would then continue with our separate TK ticket FCO-ADB and ADB-BOS. Can Delta do anything to jeopardize our separate/second itinerary? I am asking because the round trip fare is 2.5 times cheaper than the one way.