code-sharing; joint operation
Used primarily in the airline industry for code-sharing agreements, but can also refer to joint operation of transport services like buses or ships.
This route is operated jointly by two airlines.
共同運航便では、予約した航空会社と実際に運航する航空会社が異なることがある。
On a code-share flight, the airline you book with may differ from the one that actually operates the flight.