Have everything ready, tagged and within the weight restrictions. As long as you are polite and there's room, you could be arriving in style. So, the plane isn't over booked and you remain in coach. Don't despair, there are some prime spots available, even in the cheap seats. But you need to know about them and how to get them.
Some airlines offer pre-arranged seating.
Ask your travel agent when you're booking your tickets if you may also pre-book your seats. The absolute best seats in the house are in the emergency exit row. There is ample leg room to stretch right out and get comfortable. If your airline does not allow pre-booked seats, then it is important to get to the airport early in order to be one of the lucky ones who won't have cramped knees and claustrophobia. An extra hour in the airport will be well worth the exchange when it comes to comfort.