Each letter represents a fare bucket: C is business class, D and I are discounted business class, the rest are various categories of coach class. The numerals tell you how many seats are for sale in each class, but no figure higher than 9 is shown. Thus, if 15 seats are available in C class, it will show C9.

Bruce

[This message has been edited by bdschobel (edited Mar 06, 2004).]