By Veronika Bondarenko Some flyers got a surprise email about the upcoming program. All-you-can-fly subscriptions have a mixed history. The most iconic experience of an unlimited flight subscription is still when one New York investment banker Steven Rothstein bought an unlimited American Airlines (AAL) – Get American Airlines Group Inc. Report pass for $250,000 in the 1980s and spent the next 25 years flying first class nonstop. The airline had stopped selling the pass in 1994 and, in 2009, withdrew it from Rothstein on claims of “fraudulent usage”–the airline claimed that Rothstein’s freque…