Originally Posted by
Cyba
Thanks for the suggestion. I tried that already before but the result I'm getting is a series of one-way fares (xxx-yyy and yyy-zzz) instead of booking both sectors on the through fare basis (xxx-zzz) which the rules incidentally allow. So I was looking to see if I could specify which fare code to use but it doesn't seem to work.
Are you sure YY fare exists, which has a fare basis code YRT, between FRA and LON? "YRT" is not a generic code for all unrestricted full Y fares. (e.g. YR) I am seeing YIFRT fare by using the syntax below, although not sure if this fare fullfill your requirements.
FRA:: / F YY.FRA-LON (or add, ".YIFRT")
LON::
Also, in case, you are looking for LH fllight:
LH finalises to abandon IATA fares
http://www.flyertalk.com/forum/showthread.php?t=723020