This annoying travel habit won’t fly with United Airlines. The major airline recently made clear that passengers who don’t use headphones while listening to electronic devices could get tossed off a flight — or even banned from traveling with the company. The new rule was quietly added to United’s contract of carriage terms under its “refusal to transport” section late last month — a change first reported on by CBS News. “Passengers who fail to use headphones while listening to audio or video