What does it mean when a flight number has one airline’s name but the flight is actually operated by another airline? (What is codesharing?) Both airlines have code-sharing agreement and operate and transport passengers each other. If you have a codeshare flight, the baggage regulation and check-in is handled by the operating airline. Was this article helpful? Can't find what you're looking for? Inquiry Form Related articles What do I need to check in for my flight? I am enrolled in a mileage plan. Can I get mileage with DeNA TRAVEL? I cancelled my reservation but I have yet to receive my refund. My flight is cancelled by the airline. What should I do? What do I need when I contact the airline?