I flew KG last year TVF-MSP connecting to United to EWR and I was pretty impressed. Cool to fly a 328JET and as a previous poster noted, the best snack basket in the sky (if you don’t mind a few thousand excess calories )

Could not OLCI.

I gate checked bags so I don’t know about interlining. Boarding passes were issued for both flights ex TVF but only to MSP ex EWR. I had to get my BP at the gate in MSP which was no big deal.

No MP credit though (wasn’t expecting any based on the info I could gather but was still hoping for a nice little surprise).