Originally Posted by ReelChief
Even a simple itinerary may be a problem. I deliberately chose a departure date when it showed (and is still showing) two "A" seats available on MRU-LHR (using Expert Flyer) but two attempts to have BA-MRU book it have been fruitless-- although we are waitlisted. (Also ITA also shows two A seats as being bookable). If BA-MRU can't book them, who can?
I experienced this type of problem when booking my last xONEx; ExpertFlyer was showing D4 on QF9 MEL-LHR but CX in CMB could not book it; they could not even get QF to release any on request! In the end I went SYD-LHR with a cheap flight MEL-SYD.
I have been advised that in quite a few cases, fare bucket availabity can vary depending opon the region it is beeing booked from. In most cases this is not an issue, but in my case above, and it seems, your's, it becomes a problem. FWIW, I believe ExpertFlyer shows availability from a North American "viewpoint".