Have you checked the Delta website?

Doing a flexible search for October in D1, I'm seeing a few combinations that come in at 160k/person for RT J (most connecting on AS in Seattle or Portland).

You'd just need to transfer in 20k AMEX to DL and then would zero out your DL accounts (320k total for 2 travelers)

Example:

October 3rd: LAX - PDX (AS or DL) - NRT (DL 763)

October 9th: HND - LAX (DL 777)

320k + $88.52