Codeshare Flight

A codeshare flight is a single physical flight sold under two or more airline codes and flight numbers by partner carriers. You might book a ticket from Delta but actually fly on an Air France-operated aircraft under a different flight number. The airline flying the plane is the operating carrier, while the airline selling the ticket without flying it is the marketing carrier.

One aircraft carries multiple flight numbers simultaneously, so a Delta-operated flight might also be sold as an Air France, KLM, or Korean Air number under each partner's own code. Baggage rules, check-in, seat assignments, and mileage accrual typically follow the operating carrier, not the airline that sold the ticket. Aircraft type, crew, and safety standards belong entirely to the operating carrier regardless of which name appears on your boarding pass.

A codeshare lets multiple airlines sell the same physical flight under their own flight numbers, while an interline agreement simply allows separate airlines to check baggage through and issue connecting tickets across different flights without sharing flight numbers. Codeshares are common within alliances like Star Alliance, Oneworld, and SkyTeam, whereas interline deals can exist between airlines with no alliance membership at all. Both arrangements support multi-carrier itineraries, but only a codeshare puts a partner's flight number on a plane it doesn't operate.

Check the 'operated by' line on your itinerary or booking confirmation, which lists the actual airline flying the aircraft separate from the airline you purchased the ticket from. This detail typically appears near the flight number and departure time during checkout on airline websites and travel booking platforms. If the operating carrier differs from your ticketing airline, you're on a codeshare flight.

Yes, baggage allowances, seat selection options, and boarding procedures generally follow the operating carrier's policies, not the marketing carrier's rules even though you paid that airline. For example, a United ticket operated by Lufthansa will follow Lufthansa's checked-bag limits and boarding process, not United's. Always confirm these details with the operating carrier before your trip to avoid surprises at the airport.

Nearly all major carriers within Star Alliance, Oneworld, and SkyTeam use codesharing, along with dozens of airlines outside those alliances through bilateral partnerships. It's common on both international long-haul routes and domestic regional legs, especially when a regional subsidiary feeds passengers into a major hub carrier's network. This practice became widespread after U.S. airline deregulation in the late 1980s and has since become standard industry practice worldwide.

Booking a codeshare can be worth it when the marketing carrier offers better mileage earning, pricing, or bundled itineraries connecting to other flights on the same ticket. However, booking directly with the operating carrier sometimes simplifies rebooking and customer service if disruptions occur, since that airline controls the actual flight operation. CEOFLIGHTS specialists can help find discounted business class fares — call (888) 851-6897.