I booked PE and so if I either do a bid upgrade to Upper Class or buy the upgrade at check-in (SEA>LHR), what do they send to DL in terms of fare class? I am DL Diamond and already earning 30% MQD / 150% MQM so mostly just curious. I doubt it would be J and since I'm on K (PE) fare, it earns the same MQM as all non-J business fares. I don't need the extra 10% MQD but would be open to 200% MQM!