What is a codeshare?

FlightStats can help you find the right flight to track even if it is a codeshare. A codeshare is essentially a marketing agreement between two airlines. A flight operated by carrier A is marketed under a different flight number by carrier B. For example, Lufthansa 9355 is operated by (UA) United Airlines and is sold by United as UA 938. The only information that comes across the ASDI stream is the information for the operating carrier's flight number (for example UA 938). Some flight tracker tools require the user to know the operating carrier's flight number. FlightStats does the mapping so that the codeshare flight number can be used instead.