Originally Posted by Bahston
By my reading, this is nothing more than an interlining agreement.

https://en.wikipedia.org/wiki/Interlining



No, interlining doesn't allow you to sell seats on the other airlines flight. Now, in case of IROPS (Irregular Operations), they can endorse your ticket over to the other airline through an interline agreement, but they pay the airline for that seat. Selling seats on the other carrier requires more than an interline agreement.