Codeshare
An arrangement in which one airline markets and sells seats on a flight physically operated by a different carrier, with both airlines' codes appearing in schedules.
A codeshare is a commercial agreement between two airlines under which one carrier places its flight designator code on a flight operated by a partner airline. Passengers book through the marketing airline and receive a ticket with that airline's code, but travel on an aircraft owned and operated by a different carrier. Codeshares expand each airline's apparent network without requiring it to operate supplementary aircraft or obtain new route authorizations.
Why it matters
Codeshares are ubiquitous in international corporate travel because they enable single-ticket, through-checked-bag itineraries across routes that no single carrier could operate independently. For programme managers, codeshares also create complexity: the fare rules, baggage policies, seat maps, and service standards may differ depending on which airline is marketing the flight versus operating it. When things go wrong, the question of which carrier is responsible for rebooking, compensation, or baggage recovery requires knowing who the operating carrier is.
How it works in practice
When a traveler books a codeshare flight, the reservation appears in the marketing airline's booking system but is managed operationally by the operating carrier. The boarding pass may display the marketing airline's code (e.g., BA 6000) while the aircraft and crew are operated by the partner. Frequent flyer mileage accrual and redemption, priority check-in, and lounge access all depend on the airline's partnership agreement and which code the ticket was issued under.
The takeaway
Always identify which airline operates the physical flight on a codeshare booking, particularly for long-haul or connecting itineraries. Operating carrier service standards — seat pitch, onboard Wi-Fi, meal quality — may differ substantially from those of the marketing airline. Understanding this prevents traveler dissatisfaction when the experience does not match the airline brand on the ticket.