Although the seats selected were available when you started the assignment process, there is a chance a seat was assigned to another customer prior to the completion of your transaction.
If seats are unavailable on the displayed seat map, you can obtain a seat assignment upon check-in.
Delta accommodates the seating requirements of customers with certain types of disabilities. This could result in the occasional need to change another individual's pre-assigned seat, with bulkhead seats being particularly subject to reassignment. We appreciate your cooperation in these special circumstances.