Originally Posted by Dovster

I don't know if this will work, but it is worth a try:

Very often, a husband and wife will ask for the window and aisle seats, leaving the middle seat empty in the hope that no one will sit there.

Trying calling Delta and asking if there is such a couple on the flight. If so, request that middle seat. They will almost certainly be willing to trade the aisle seat for the middle one in order to sit together.