The difference lies in the flight number and the aircraft. A Transit Passenger arrives at an airport on a flight and departs on the same flight number and usually the same aircraft after a short stop for refueling or boarding new passengers. They often stay in a designated "transit lounge" or even remain on the plane. A Transfer Passenger, however, arrives on one flight and switches to a completely different flight number (and usually a different aircraft) to reach their final destination. In 2026, this distinction is important for visa requirements: many countries allow "Transit" without a visa if you stay behind the security line for a few hours, but "Transferring" between different airlines might require you to collect your bags and re-clear security, which could technically count as "entering the country" and thus necessitate a transit visa or specific travel authorization.