As if “award” plane tickets aren’t hard enough to come by, airlines are putting even more controls on those coveted seats — in some instances understandable, but in others apparently artificial and questionable.

Most major U.S. carriers are reporting record numbers of issued mileage tickets, but they are not a result of more available seats so much as more passengers rushing to beat rises of redemption mileage levels. As I wrote three weeks ago, the value of frequent-flier miles is dropping, and the airlines want them to be used up because they are a balance-sheet liability. With most carriers’ domestic capacity shrinking between 5 percent and 16 percent this fall, the number of mileage seats will naturally be reduced as well…