These won't qualify for 50% back with Amex, right? Because the outbound is operated by Lufthansa, even though it has a United flight number.
Based on the title it sounds like the OP is saying the ticket is issued by AC, not UA.
Sorry, I wasn't clear. The flights on the dates I want are issued by UA with a UA flight number. Outbound is operated by LH. Inbound is UA to EWR.
That should qualify for BP 50%/35% back