I don't see the point, really, of fall/winter double miles programs -- from the airlines perspective. If you have established your "go to" airline for status for 2009, you are unlikely to switch for fall/winter because of a double EQM plan that lasts 3.5 months. Sure there are exceptions -- lots of travel in that time period, already hit top level on one airline, etc. But it seems the payoff for airlines is much better to do this in Spring when people are still "free agents" for the year.