Twanger said:
Lesson learned - if you outbound flight gets changed, make sure you're return flight is intact!
Booking one-way flights has been working out pretty well for us. We frequently take United down on a weekend and AA or another airline back. For the last couple of years it has been cheaper that way. We also prefer off-season travel and sticking to a single airline for both directions limits choices a lot.
Cheers, RickG