Flying at 65,000 feet (nearly 20 kilometers) places an aircraft in the lower stratosphere, well above the typical 30,000–40,000 foot ceiling of commercial airliners. Very few aircraft are designed to operate at this extreme altitude due to the thin air and low oxygen levels. The most famous example is the NASA ER-2 (Earth Resources 2), a civilian version of the Lockheed U-2 spy plane, which is used for high-altitude scientific research and can cruise at over 70,000 feet. Certain advanced military fighter jets, such as the Lockheed Martin F-22 Raptor and the Mikoyan MiG-31, have "service ceilings" near 60,000 to 65,000 feet, though they rarely maintain these heights for long. Historically, the SR-71 Blackbird and the Concorde were famous for sustained high-altitude flight, with the SR-71 exceeding 85,000 feet. Today, high-altitude long-endurance (HALE) unmanned aerial vehicles (UAVs) like the Northrop Grumman MQ-4C Triton are also designed to perform surveillance missions at 60,000+ feet for extended periods.
Very few aircraft are capable of sustained flight at 65,000 feet, as the air is extremely thin and requires specialized engine and wing designs. The most famous example is the Lockheed U-2 "Dragon Lady" and its NASA sibling, the ER-2, which are high-altitude reconnaissance and research aircraft. Military fighter jets like the F-22 Raptor and F-15 Eagle have "service ceilings" near 60,000 to 65,000 feet, though they typically operate much lower. Historically, the Concorde cruised at up to 60,000 feet, and the legendary SR-71 Blackbird could fly well above 80,000 feet. In the modern era, high-altitude long-endurance (HALE) drones like the Northrop Grumman RQ-4 Global Hawk regularly operate at these altitudes for surveillance missions. At 65,000 feet, an aircraft is above 95% of the Earth's atmosphere, providing a clear view of the planet and a dark, near-space sky.