First flight today is NS to LAS on NW and I successfully checked in on NWA.COM.

Trying to checkin for tomorrow's return. First flight DL, next segment NW:

"Your first flight is operated by Northwest Airlines and will require you to check in with Northwest Airlines"

So, it directs me to NWA.COM where I get:

"The first departing flight is operated by Delta Air Lines.
Select Continue to be redirected to delta.com to complete check-in. "

So, NWA.COM correctly recognizes tomorrows segments, but returns me to DELTA. DELTA.COM incorrectly notices the very first segment of the itinerary today and redirects me to NWA.COM.

CAN SOMEONE GET ME OUT OF HERE?