Whether you pay for a seat on JetBlue in 2026 depends entirely on the fare class you purchase. If you book a Blue Basic fare (the most restrictive tier), you do not get a free seat assignment; you must pay a fee to select a seat in advance, or one will be randomly assigned to you at check-in. For all other fare classes—including Blue, Blue Plus, and Blue Extra—standard "Core" seat selection is included in the ticket price at no extra cost. However, if you want "Even More Space" seats (which offer up to 7 inches of extra legroom and early boarding), there is always an additional fee regardless of your fare class, unless you have Mosaic elite status. Mosaic members typically receive complimentary Even More Space seats at check-in or booking, depending on their level. In 2026, JetBlue has also introduced "Core Preferred" seats in desirable locations (like the front of the cabin), which may require a small fee for non-Mosaic members.