Isn't this the purpose of the limited E & P buckets? I can understand if the aircraft is downgraded from a 321 to a 757 several people will be S.O.L (not that that's any excuse), but in a situation such as a FAM, it seems ludicrous that somebody with an A fare would get the boot. I can't imagine an F cabin full of F, A, Y & B fares with no upgraded roach fares in the mix.