Websites such as SeatGuru and SeatExpert allow users to view seat maps for many major airlines. These sites provide details about seat width and leg room for each aircraft type. Economy seats in Delta's A320 planes are 17.2 inches wide, while economy seats on United A320s are 17.8 inches wide.
Some airlines offer premium economy seats that are less expensive than first or business class. These seats are usually the same size as economy class seats, but offer extra leg room.Learn more about Airplanes & Helicopters