I don't see airlines extending the double miles promotion right now. History shows us that frequent flyer programs go dormant during the holidays and i think you'll find these programs re-grouping and planning on other strategy for the new year. It's my opinion that the 'double miles' promotion has not been that successful - i base that on the speed in which the airlines extended it from one month to two. they did that because it generally didn't require any thinking, planning and implementation since the registration process si so automatic these days. Once the new year arrives, my guess is that you'll find new things to occupy your time as a frequent flyer, things that these frequent flyer programs will have had time to plan and promote.