In 2026, airline safety protocols mandate that cabin crew conduct a physical "walk-through" of the cabin at least every 15 to 20 minutes during the cruise phase of a flight. These checks are not just for service; they are critical "safety and security" sweeps. Crew members are trained to look for signs of ill passengers, check for smoke or unusual odors coming from the lavatories, and ensure that no suspicious items have been left in the aisles. During "quiet hours" on long-haul flights, these checks are performed more discreetly using flashlights, but the frequency remains consistent. Additionally, the lavatories must be checked every 30 minutes to ensure they are clean and that the smoke detectors have not been tampered with. These "cabin monitoring" duties are a primary regulatory requirement from agencies like the FAA and EASA. If the "Fasten Seatbelt" sign is on due to turbulence, the crew may be grounded for their own safety, but as soon as it is safe, the 20-minute cycle resumes to ensure the well-being of all passengers on board.