Lost luggage and rude attendants may make you want to scream. Here are the U.S. airlines that people complained about the most. (AirTran) 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...