Factoid of the day: Miles for clunkers?

I've been on the road a lot lately — which means that my posts have been infrequent and that they have a travel theme. Today's the same. Sitting on the tarmac in O'Hare for two hours tonight, I came across this stunner in today's Wall Street Journal:

"There are an estimated 10 trillion unused frequent-flier miles in circulation now, worth some $165 billion."

That dollar figure is more than the GDP of Egypt. And if you were to distribute all those miles evenly among Americans, it would amount...