I'm sure this is the shortest blog entry that I've ever written, and it will probably be the shortest I ever write. But, it answers a question that plagues me.

Is it flier or flyer?

Both are correct. If you check the AP stylebook, it lists "flier" as the preferred spelling, but notes that "flyer" is an accepted variant. Both of these spellings are correct for both meanings of the word, too. So, whether you are referring to an aviator or an advertising hand-out, you're free to use either version. Next time someone tells you that you're using the wrong word, tell them to get bent.

The most important thing is consistency. Try to use the same spelling every time.