The abbreviation is the fare basis that is the short code way of referring to the various ticket types, and is printed on the tickets.
For xONEn
x=A for first, D for business, L for economy - the subclasses that the reservations need to be made in.
ONE = ONeworld Explorer ticket type
n=3/4/5/6 the number of continents to be covered
Similarly:
xGLOBnn for Global Explorer, where nn indicates the maximum number of miles allowed on the routing.
[This message has been edited by christep (edited 10-11-2003).]