It's one of the oldest adages of the retail world: "The customer is always right."
Of course, very often the customer is wrong. Every day customers behave in ways that make the lives of waiters, cashiers, customer service reps and other retail workers miserable. And in many cases, these customers don't even realize how annoying they're being.
To rectify this, we've decided to talk to the people on the other side of the desk, with the hope of educating consumers on what sort of behavior makes life difficult for the people serving them. In the first part of the series we spoke to people in the restaurant industry, and in part two we asked hotel workers how to be a responsible guest. We turn now to the airline industry, where we asked flight attendants and customer service representatives for tips on keeping the skies friendly.