Codeshare flights are cooperative agreements between two or more airlines that allow them to share the same flight. One airline operates the flight, while its partner markets it under a different flight number and brand. For travelers, this can create the appearance of booking with one airline, when the actual flight is operated by another.
These agreements are common among major carriers, especially those in global airline alliances. A codeshare helps airlines expand their network without adding new routes, while passengers benefit from simplified booking and better connectivity.
However, codeshares can lead to confusion, particularly around baggage handling, check-in, loyalty point accrual and service expectations, which are always based on the operating carrier.
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Understanding codeshares is key to managing traveler expectations, especially on international or multi-leg itineraries. A traveler may book through a preferred carrier but find that the flight is operated by a partner airline with different seating, rules and onboard service.
This can affect loyalty program benefits, upgrade eligibility and travel experience. It can also complicate disruption management if the booking airline and the operating airline refer the traveler back and forth during delays or cancellations.
TMCs play a valuable role in identifying codeshare flights, clarifying who operates each segment, and ensuring consistent service across the itinerary.
A business traveler books a flight through WestJet with a WS flight number, assuming it will be a WestJet aircraft. At the gate, they discover the flight is operated by Delta. The traveler’s WestJet loyalty benefits do not apply to seat upgrades or lounge access, creating confusion.
In another case, a traveler books through Air Canada but flies on a codeshare operated by Lufthansa. Baggage must be checked through Lufthansa and seat selections follow Lufthansa’s rules, not Air Canada’s.
