DL is generally very good about recognizing AS elite status online.

1. Correct.

2. Once booked, you flights should read Medallion Upgrade Requested when accessing your reservation on delta.com. If they only read Upgrade Eligible, you need to call DL and ask them to look into the notes of your reservation and delete the line "Passenger Declines Complementary Upgrade." Each flight should then read Medallion Upgrade Requested.

You will be able to select preferred seats for no charge both before and after booking. Economy Comfort is not free or discounted for AS elites on flights with domestic service.

3. Download the official Fly Delta app and add your reservation while logged in as a guest. This makes it easier to check in for your flight, get an e-boarding pass if your itinerary is eligible, view upgrade lists which only reflect passengers who've already checked in, and in the event of flight delays, you can choose alternate flights.

Enjoy flying DL, try the Biscoff cookies, and good luck on getting an upgrade.