Airline space seems tighter than ever. Before you recline your seat, make sure you warn the passenger behind you.

Broken computer screens, spilled drinks and bruised knees are just a few of the hazards of what is supposed to be a relaxing seat position. Done properly, the seat will recline without slamming your back against it.

If you decide to nap, don't turn it into a bed. Rolling over in your seat or shifting positions abruptly while the seat is reclined will launch anything on the tray table behind you.

Be aware -- and be courteous!