When you go online to book airfare at Airtran, once the available flights come up it lists Web special, two discount coach, three regular coach, and business class. If you click on the price for each one the only difference in the six coach fares are 'class of service with web special being L class, the two discount coach Q and K class, and the three regular coach M, B, and Y class. It may be a stupid question, but what is the difference in the 'L, Q, K, M, B, and Y class of service'