Yes, if you book a standard Delta Main Cabin ticket in 2026, you are permitted to choose your seat for free at the time of booking. This is one of the primary differences between Main Cabin and "Basic Economy"; in Basic Economy, your seat is assigned at the gate and cannot be changed. In Main Cabin, you can access the seat map via the Delta app or website and select from any available "standard" seat. You also have the option to pay an additional fee to upgrade to "Preferred Seats," which are standard seats located in more desirable areas of the cabin, such as closer to the front or in exit rows. If you have Delta Medallion status, these preferred seats are often available to you for free. It is important to select your seat as early as possible, as popular window and aisle seats fill up quickly. If you do not select a seat before check-in, the system will assign you one, but you can still attempt to change it for free during the 24-hour check-in window if other options are available.