Now that American Airlines has gobbled up the bankrupt TWA, some details of the inevitable end to the TWA Aviators frequent-flyer program have been announced. According to the TWA website,
http://www.twa.com/ffbenroll/news.html
Aviators will cease to exist on November 30. (This assumes a pro forma approval by the bankruptcy court on June 18.) TWA members will receive an automatic one-time credit in their American AAdvantage account to cover the entire balance of their Aviators activity. But the credit depends on your name and address being listed identically in the records of both Aviators and AAdvantage. Travelers whose identities don't match or who don't have an existing AAdvantage account will have to register to receive the credit.