What is the definition of a direct flight?

A direct flight is defined as a flight that may have one or more stops along its route but does not require passengers to change planes during those stops. This means that the journey remains on the same flight number, allowing passengers to stay in their seats while the plane lands at intermediate airports for fuel or other operational reasons. As a result, passengers do not have to undergo the hassle of disembarking and boarding a different aircraft, making travel more convenient compared to flights that necessitate a change of planes.

The other options describe different scenarios that do not align with the standard definition of a direct flight. A flight with one or more stops requiring a change of planes indicates a connection, which is distinct from a direct flight. Similarly, a flight that makes no stops at all would be categorized as a non-stop flight, rather than a direct flight. Finally, a one-way flight to a destination describes the nature of the ticket rather than the specific characteristics of the flight itself.