Definite KE, my bad. I checked in for tonight's flight via Delta app, boarding passes in my Apple Wallet now, will print paper ones as well though.

I still have the physical "FLT COUPON REQ" "boarding passes" DL SMF issued for the HA flight for each of us showing the seats, I plan to present those & the receipt from Hawaiian showing we purchased each of the seats DL booked.

FWIW I paid HA $1,745.20 so that's what I'm after.