A direct flight is a flight with no intermediate stops between the origin and final destination airports.
Key characteristics of direct flights include
Non-stop travel. A direct flight transports passengers directly from the departure airport to the arrival airport without any layovers or intermediate stops.
Same flight number. Since it is the same aircraft traveling straight through to the final destination, a direct flight keeps the same flight number throughout the journey.
No need to deplane. Passengers on a direct flight can remain aboard the aircraft for the full trip without having to deboard and switch planes during a layover. This can save on time and logistics.
Travel time savings. Direct flights help minimize total travel time by eliminating the need for extra takeoffs, landings, and potential delays from layovers and plane changes. This time savings can be substantial on long haul flights.
Operational simplicity. For airlines and airports, direct flights simplify operations like baggage handling, fueling, boarding, catering, etc. by limiting stops along the way.
So in summary, a direct flight offers travel between two points with a straight continuous journey and no intermediate landings or transfers for operational efficiency and time savings. It is not interrupted and keeps the original flight number from start to finish.
Can I Leave the Plane During a Layover on a Direct Flight?
No, you generally cannot leave the plane during a layover on a direct flight.
Direct flights, by definition, do not have any scheduled stops or layovers between the originating airport and the final destination airport. The same aircraft and flight number continues uninterrupted straight through to the destination airport.
So a direct flight does not involve layovers where passengers deplane or the aircraft might be parked awaiting the continuation of the journey. Any intermediate technical stops for refueling or the like that might be required on some longer direct flights still require passengers to remain on board the aircraft during these brief pit stops. They cannot disembark and leave the airport terminal during the refueling process.
The only exception would be in the case of an unforeseen long delay on the ground during a direct flight, for example due to mechanical issues. If the delay stretched over multiple hours, the airline might then permit passengers to temporarily exit the plane until the flight is cleared to resume towards its final destination. Other than essentially emergency cases like that, passengers must stay aboard for all phases of travel on a cabin-to-cabin direct flight.