On international flights you cannot sit in the actual jumpseat. Flowback means that if there is a seat in the back, you can ride in it.

So, for example, we have jumpseat agreement with Air Canada And you can ride in the passenger cabin if a seat is available, but you cannot ever ride in the actual jumpseat on their aircraft.

Our agreement with American, however, is domestic only, but you can ride in the actual jumpseat or an available passenger seat. Some carriers extend jumpseat privileges to international travel and some don't.