The minimum speed a plane can fly—known as its "Stall Speed"—varies dramatically based on the aircraft's weight, wing design, and flap settings. For a standard commercial jet like a Boeing 737 or Airbus A320, the stall speed is typically around 120 to 150 mph (105–130 knots) in a landing configuration with full flaps. If the plane flies slower than this, the wings lose the "lift" required to support its weight, and it will begin to fall. General aviation planes, like a Cessna 172, have a much lower "gold standard" stall speed of about 50 to 60 mph, allowing them to take off and land on very short runways. Special "STOL" (Short Takeoff and Landing) aircraft can fly even slower, sometimes as low as 30 mph. For passengers, the sensation of "slowing down" is most noticeable during the final approach, where the pilot maintains a speed about 30% above the stall speed to ensure a safe margin for gusts and maneuvers. Modern flight computers and "alpha" protections in 2026 make it nearly impossible for a pilot to accidentally fly below these safety limits during a normal commercial flight.