I have an international flight in September that I have already changed once because my tour was rescheduled. It is on Delta from ATL to Frankfurt. I was able to change it for no cost. Now, the tour has been pushed back a couple of weeks so I need to change it again. I'm wondering how many times I can do this without a change fee? I'm afraid if travel restrictions don't loosen up, the tour will be completely cancelled. I had rather move it than get a credit and rebook because I got a great rate for this trip.