If you're curious how to get on Delta upgrade list, know that Delta Comfort+ upgrades are available to Medallion members and eligible passengers. These upgrades are often processed at check-in or the gate, depending on availability. Booking Main Cabin fares increases eligibility for automatic upgrades. Travelers should always opt-in for upgrades in their Delta SkyMiles profile. Check ... https://airlinesofficeaddress.com/blog/how-to-get-a-free-upgrade-on-delta/