By Everett Potter

When Andrew Schrage discovered that his seatback TV wasn’t working on his JetBlue flight from Chicago to Boston, he didn’t wait until he landed to complain to the airline. Schrage, an editor at the website MoneyCrashers.com, tweeted @JetBlue before the plane took off, and the airline responded—with a $50 voucher.

Twitter may be changing how we complain to the airlines, but there’s still a lot to complain about. According to the latest Department of Transportation (DOT) report, the agency received 710 complaints about airline service from May 2010 to May 2011—that’s 22 percent higher than the year before.

The most complained-about airlines?

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