For a CodeShare Flight

Operating carrier of codeshare flight will provide services of both airport and in-flight.
Operating carrier's policy applies for counter hours, lounge service, in-flight sevice, acceptance of infants and children, and disruption handling etc.
Conditions for baggage check in and free baggage allowance depend on the codeshare carrier. Please check with reservation or operating carrier for the details.
(Please see followings for the codeshare flight with American Airlines and WestJet.)

When traveling on codeshare flights operated by American Airlines, the operating carrier's conditions of carriage may apply with respect to certain services.

Refreshments are available to buy on shorthaul British Airways flights to/from London Heathrow and London Gatwick in Economy class.

When traveling on codeshare flights operated by Finnair, the operating carrier's conditions of carriage may apply with respect to certain services.
If you are traveling on Finnair Operating codeshare flight, please click below.

When traveling on codeshare flights operated by Iberia, the operating carrier's conditions of carriage may apply with respect to certain services.
If you are traveling on Iberia Operating codeshare flight, please click below.

When traveling on codeshare flights operated by Malaysia Airlines, the operating carrier's conditions of carriage may apply with respect to certain services.
If you are traveling on Malaysia Airlines Operating codeshare flight, please click below.

When traveling on codeshare flights operated by WestJet, the operating carrier's conditions of carriage may apply with respect to certain services.
If you are traveling on WestJet Operating codeshare flight, please click below.

Depends on the flight, check-in may be handled at the Operating carriers counter.

Mileage will be accumulated when you book and fly under JL flight number, except for the codeshare operated by JMB partner carrier.
Please confirm at reservation, you are booked with JL flight number.

Web Check-in (Quic) is not eligible for Code-share flights operated by other airlines except American Airlines, British Airways, Finnair, Iberia and Malaysia Airlines.