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 is a Low-Cost Carrier (LCC)?