According to strict 2026 FAA and international aviation safety regulations, access to the cockpit (flight deck) during flight is restricted to authorized crew members and specifically approved personnel. The primary occupants are the assigned pilots (Captain and First Officer). In certain scenarios, an FAA inspector, a check-airman conducting a proficiency evaluation, or an additional "relief pilot" for long-haul journeys may occupy the jumpseat. Following the heightened security protocols established after 9/11, the cockpit door remains locked and reinforced throughout the flight. Flight attendants are permitted to enter briefly to provide meals or to maintain the "Rule of Two" if one pilot needs to leave for physiological needs, but they must follow a rigorous "challenge-response" identification procedure before the door is opened. Passengers, including children, are strictly prohibited from entering the cockpit while the aircraft is in motion or in flight. While some pilots may allow a quick "peek" or photo for a child while the plane is parked at the gate with the engines off, once the "sterile cockpit" phase begins, the flight deck becomes a restricted-access command center.