There are a lot of different airplanes in the skies.  Some of them are military planes from the armed forces or private planes but most of them are commercial airplanes.  Commercial airplanes are the ones that airlines use for travel.  Some airlines would be USAir, Continental, Delta and United Airlines.
     We have listed some of the most common commercial airplanes.  If you click on the name of the plane, you will see a seating plan for it.