I got a good deal on tickets for our June trip a few months ago. Both ways to and from Chicago non-stop. However, since booking the schedule changed a few times with me having to request a completely different flight. The capacity on the plane seems pretty low right now and I am starting to get worried about another change. Does that plane need to be at another airport for a different flight, which would force Air Tran to make the flight? Or could I be looking at more changes? Thanks.