Yes, pilots use the bathroom during flight, and there are strict security protocols to handle this. On a standard commercial flight, when a pilot needs to leave the cockpit, a flight attendant is often called to stand inside the flight deck or "block" the galley area with a cart to ensure the door is never vulnerable to unauthorized entry. Pilots typically plan their breaks for "cruise" flight—the stable period between climb and descent—to avoid needing the restroom during critical phases like takeoff or landing. For long-haul flights (10+ hours), there are usually relief pilots on board who rotate in, allowing the primary crew to take full rest and bathroom breaks. In single-pilot light aircraft, pilots must "plan ahead" or, in extreme cases, use specialized urine collection bags known as "piddle packs" designed for hands-free use.