A leg number is a segment of a flight that is identified by a unique flight number and operates between the point where passengers or cargo first board an aircraft and their final destination. A leg is a trip of an aircraft from one airport to another, and a flight with multiple legs will have multiple leg numbers. For example, a long-haul flight from New York to Tokyo may have multiple legs, such as a leg from New York to Los Angeles, and another leg from Los Angeles to Tokyo. Each leg of the flight would have its own unique leg number.

Short flight

Long flight

long flight without unboarding passengers or cargo