I have an international trip planned for next month on US Air. They have made changes to both outbound and returning flights. The first change bumped us from first to coach due to aircraft change. We were allowed to make a change to a different flight (on continental) without cost. Now I get a phone call about a change to another flight. No class of service change (yet). Is it fair to ask to be changed to continental for this second flight. I dont want a last minute class of service change. Front cabin travel is what I use my miles for. What are my rights since this is award travel?