AI illustration: a fictional traveller looks at two aircraft from an airport window. It is not an actual airport or airline.
“Change of aircraft” on an itinerary can mean two different things: a normal connection between two flights, or one flight number that uses more than one aircraft. The second kind is easy to miss because the ticket may still look like a single flight. This page explains the terms from industry and legal sources and what they do and do not tell you.
1. One flight number, more than one aircraft
IATA’s business glossary defines “Change of Equipment en Route” as “a scheduled change of aircraft, occurring one or more times en route, but identified by one airline designator/flight number between the station of origin and the station of destination”. Its example says that “passengers must physically change aircraft” while “their flight number remains the same”. Official source.
2. How that differs from a connection
The OAG glossary defines a connection as a “transfer between two different flights at an intermediate airport”, and a flight as “the operation of one or more legs with the same Flight Designator”. Under that wording, a flight number that covers several legs is still one flight. OAG adds that, unlike a connection, “a stopover usually does not involve a change of flight number or airline, but may involve a change of aircraft”. Official source.
3. A US rule shows why the label matters
US rules call this a “change-of-gauge service”: one that “requires a change of aircraft en route but has only a single flight number”. Official source. Under 14 CFR 258.5, carriers operating such services to, from or within the United States must show them as requiring a change of aircraft in their schedule information. Carriers and ticket agents must tell a consumer in the United States before booking, and the written notice reads: “you must change aircraft en route even though your ticket may show only one flight number”. Official source.
That rule covers services to, from or within the United States. We did not find an equivalent rule for other countries, so do not assume the same notice will be given elsewhere.
4. What to check on your own itinerary
Our suggestion is to read the booking for each leg, airport and time, not just the flight number. If the same number appears with a stop in the middle, ask the airline whether passengers stay on board or change aircraft there, and whether checked bags stay tagged through. Keep the airline’s answer in writing. This is practical advice, not a rule from the sources above.
Keep these details together
Flight number and date; every airport on the itinerary; the answer on whether you change aircraft; baggage tag destination; the boarding pass for each leg.
Sources checked 28 October 2026. Glossary definitions describe industry usage, and the US rule applies only to the services it names. This page does not cover compensation, baggage allowance or what happens after a missed connection.
A Miranda House graduate and lawyer who traded courtrooms for slow travel. Cheshta travels with the batches we host ourselves, with a soft spot for travelling alongside elders.
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