This is a fee that is charged to a traveler who will be taking a flight that utilizes more than one airline. For instance, if a traveler is taking a flight that has a connector, the second flight may [..]

an arrangement between carriers to charge special rates when a passenger uses their respective airlines. The fares are negotiated by the airlines involved and the price is nearer to what the traveller [..]

Special fare for travel on two or more airlines to a destination.

two carriers combining services to compete with other carriers.

Airfare published for travel via two or more carriers.