Per the Skyteam-website, Delta offers "Exit row seats, bulkhead window and aisle seats, window and aisle seats in the front of Main Cabin free of charge. Customers in basic economy: free seating not available irrespective of loyalty tier".
In practice you don't get this on the webpage/app even when/if your Eurobonus status is recognised, but I've managed to get preferred seats assigned by contacting Delta directly.