Why does the booking fail in the last booking step?
Error: "segment sell failed"
Sometimes an error message occurs due to an incorrect availability display of the respective airline.
Availability query and sales attempt are two different processes.
When asking for a recommendation, the system first searches for availability only.
Though, if a sales attempt is started (FXZ), sales requests are sent per segment and merged into one PNR. Thus, some classes may then be "closed".