On Delta Air Lines in 2026, Main Cabin 1 is the fourth general group to board the aircraft. This group is primarily comprised of Silver Medallion members and travelers who hold a co-branded Delta SkyMiles Credit Card (like the Gold, Platinum, or Reserve American Express cards). Additionally, passengers who have purchased a "Trip Extra" or a higher-fare class that specifically includes "Priority Boarding" will also fall into this group. It follows the "Pre-Boarding," "Delta One/First Class," and "Comfort+" groups. For the 2026 traveler, being in Main Cabin 1 is a "high-value" perk because it almost guarantees that you will find available overhead bin space for your carry-on luggage before the plane reaches maximum capacity. If you are a standard "Main Cabin" passenger without a Delta credit card or elite status, you will typically be in Main Cabin 2 or 3, where bin space is often limited or already full.