Originally Posted by
mnbp
When you get seat maps as "view-only", this can mean that - due to the schedule change - your reservation and your ticket don't match anymore. Call DL and ask them to verify that your reservation is "check-in ready" - that is, that the flights you are booked on match your ticket.
Good point, and it turned out the second of the reservations this was the case. The first is still a mystery to me though! Thanks!