You can certainly ask to sit in a jump seat, but in 2026, the answer for a standard passenger will almost always be no. Under strict Federal Aviation Regulations (FARs) and international security protocols, jump seats are not for public use or sale. They are strictly reserved for authorized aviation personnel, such as off-duty pilots, flight attendants "deadheading" to another city, air traffic controllers, and government inspectors (like the FAA). These individuals must be verified through the Cockpit Access Security System (CASS) to sit in the flight deck jump seat. In the cabin, flight attendant jump seats are specifically certified only for crew members to ensure safe emergency evacuation procedures. Even if a flight is completely full, an airline cannot legally seat a paying passenger in a jump seat because the seat's safety harness and positioning are not certified for passenger use. While pilots occasionally invited children to sit in the cockpit jump seat decades ago, modern post-9/11 security laws have permanently ended this practice for the general public.