Originally Posted by
flyerCO
If you check bags through you will be checked in the whole way (i.e. receive BP for JFK-MXP). No need to checkin again at JFK. You'll be asked to show COVID related documents and passport at checking in of bags.
Your reservation should update to show both flights once bags are checked through at DFW.
I've had it work both ways. Oddly I had better success for a partner operated flight than I did a DL to DL flight. Same year. I did SEA-LAX on DL, connecting to LAX-BNE on Virgin Australia (separate tickets). In SEA, the DL agent was able to check me in and provide boarding passes for the VA LAX-BNE flight. Later that year, on another international trip, DL was unable to do the same for an SEA-BOS/BOS-AMS-BIO trip, which was DL to DL (well, AMS-BIO was operated by KLM but it was booked as a DL codeshare). While my bag could be tagged through to my destination in Europe during check-in at SEA, the agent was unable to check me in and provide boarding passes for the BOS-AMS-BIO ticket and I had to check-in for the BOS-AMS-BIO portion of the trip on arrival into BOS.