yorock asked:
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">What do you mean decrease? </font>
Airlines tend to raise the mileage levels for rewards over time. I know there are lots of examples of this, but one that quickly comes to mind is TWA used to have an award where for 60K you got a free international first ticket plus a companion upgrade ticket to first for the price of the lowest coach fare (and that fare didn't even have to be available at the time of booking). I used that one as little as six years ago. Now on the airlines I fly it's pretty much 2x that number of miles just for a first-class international ticket for one passenger. Airfares, OTOH, have stayed relatively stable - and they've certainly not gone up to this degree.
With all the triple miles promos that have happened in the last two years and all the miles floating around out there, it seems inevitable that the mileage required for rewards will only go up. Sometimes when award levels change airlines will allow you to use miles earned under the old award charts at those levels, but I'm not willing to count on that with my miles.