Whether Delta Comfort Plus has "bigger" seats depends on your definition of size; specifically, it offers significantly more legroom but typically the same seat width as the standard Main Cabin. In Comfort Plus, you get up to 3 inches of extra "pitch" (the distance between seats), which is a game-changer for taller passengers who want to avoid their knees hitting the seat in front. On some international long-haul aircraft, Comfort Plus seats also offer a deeper recline than standard economy. However, the physical width of the seat cushion and the armrest-to-armrest distance remains identical to the back of the plane. Aside from the extra legroom, the "upgrade" is more about the experience: you get dedicated overhead bin space, early boarding (just after Diamond Medallion and First Class), and complimentary alcoholic beverages on flights over 250 miles. On longer domestic and international flights, you also receive premium snacks. If you are looking for a physically wider seat with more elbow room, you would need to look into Delta Premium Select or First Class, as Comfort Plus is ultimately an enhanced economy product rather than a separate class of seating.