What do airlines charge each other?
A question springing from the "Operational Reasons" thread: when an airline, for whatever reason, books you onto another airline to complete your trip, how much do they pay that airline? Does it depend on the initial fare paid, or is there a set "industry rate" for seats in each class? Or does each airline make individual deals with various other airlines?
For example, my mother recently travelled from Sydney to Geneva in business class on Etihad. The aircraft went seriously tech before boarding in Sydney. Etihad booked her on Thai, SYD-BKK-FRA-GVA, and got her here only a couple of hours later than her original scheduled arrival time. Pretty slick work on Etihad's part - but what would they have paid Thai?