Yes, exactly. When you buy a ticket from a company that codeshares with another airline which "operates" the flight, then your ticket will not have the original flight number ( e.g. AF123 for Air France...) but will appear as a flight number with the company you bought the ticket from (e.g. JL3456). In the example of Air France, as long as your ticket would start with JL... (which happens if you buy it via the JAL website) it would be considered by JAL as one of their own group flights, even though it is technically not...