Yellowdog,
Yesterday you said that LGW bid was preference bidding with a satisfaction factor in favor of seniority. You said that the system tried to achieve 80% satisfaction for senior crew and 40% for more junior. So it is still the same preference system but with different satisfaction levels. Ours is 60% across the board for E/F.
I don't think it is a system based on seniority like the pilots is. I would still consider it a preference system.