Transport operations

linking pole between a trailer or a carriage and the harnessed animals or motorized engines

the instance or state of a public-transport vehicle or aircraft operating without passengers

Interlining, also known as interline ticketing and interline booking, is a voluntary commercial agreement between individual airlines to handle passengers traveling on itineraries that require multiple flights on multiple airlines. Such agreements allow passengers to change from one flight on one airline to another flight on another airline without having to gather their bags or check-in again. Airlines can also promise free rebooking if the connection is lost due to a delay.

period of testing or a trial

riding on another person's back