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Flight interchange is an agreement where two or more airlines operate the same route together. One airline provides the aircraft and crew, while partner airlines sell tickets under their own brand and flight numbers. This allows airlines to offer destinations outside their direct network.
-A single flight may carry multiple flight numbers from different airlines.
-The operating airline runs the flight, while others market it.
-Passengers book through their chosen airline but may fly on a partner’s plane.
-Baggage and boarding passes are usually handled seamlessly.
The concept began in the 1930s–40s in the U.S. when airlines like Delta and Braniff shared aircraft under strict regulations. The aircraft could fly with one airline’s crew on one leg, then continue with another’s crew without passengers switching planes.
After airline deregulation in 1978, interchange evolved into code-sharing, where the cooperation is focused more on marketing and scheduling rather than swapping crews.
For Passengers
-Access to more destinations with one booking.
-Baggage checked through to the final stop.
-Reduced wait times with coordinated schedules.
For Airlines
-Expanded global presence without extra aircraft.
-Shared operational costs and improved efficiency.
-Stronger competitiveness through partnerships.
-Passenger Confusion: Flyers may not realize which airline is operating the flight.
-Service Variations: Comfort and quality may differ between partners.
-Accountability Issues: Complaints and delays can cause disputes over responsibility.
-Legal Barriers: Some nations restrict code-sharing to protect national carriers.
Today, flight interchange is mainly seen as code-sharing within alliances such as:
-Star Alliance (Lufthansa, United, Singapore Airlines)
-SkyTeam (Delta, Air France, KLM)
-OneWorld (American Airlines, British Airways, Qatar Airways)
Example: A passenger buys a ticket from American Airlines for New York–Madrid, but the actual aircraft is operated by Iberia.
Flight interchange transformed global aviation by allowing airlines to connect passengers beyond their routes. From its early days of shared aircraft to today’s code-sharing, it remains a key strategy for enhancing passenger convenience and airline competitiveness in an interconnected world.
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