Originally Posted by
opus17
It's only a problem if bags are checked through to the final destination.
If you have a 2-day gap, be nice and call the airline the day before to cancel the last reservation (say you had to make other plans) -- I've done this (when I actually had to make other plans!) without causing trouble, and the airline is free to sell the seat.
I wouldn't call. The airline is free to sell the seat anyways - that's what overbooking is all about - and they can't come after you as easily for the fare difference.