I just spoke with my credit card service department. There is no time limit before the flight date to file a dispute if US Air goes bankrupt. I can purchase the ticket as far in advance as I wish with no worries.
The 2 months time limit comes into effect starting when the airline goes bankrupt.
So, if US air goes into finacial default in say, August, I would have until October to dispute, which of course I would of already have done, the first minute I heard the news! :)
