The world's most useless frequent flier programs revealed

Airline frequent-flier programs may be useless, but some are more useless than others. That’s the takeaway from a new survey by website MileCards.com, which shared its results with me even though I’m America’s No. 1 loyalty-program critic. What were they thinking? The research probably won’t change your mind about the folly of frequent-flier programs, but it is useful in one respect: It separates the loyalty schemes in which you can’t possibly win from the one…