I notice that L will be the class for directly booked in economy (instead of M) but what about downgraded First and Business tickets. If no A is available, will it be considered D or J in business and what about economy (will it be L or Y). I read in some other post that it should be Y if you are waitlisted on A or D.

I read the fare rules posted from BA but could not find this info on class booked for downgraded travel.