Army-grade fighter jets can go a bit increased than business flights with a spread upwards of fifty,000 ft above sea stage, based on Easy Flying, however specifics aren’t accessible, particularly on a per-jet foundation, because of navy safety considerations.
That stated, we do have an thought of a possible higher restrict because of a world document set again in 1976. Earlier than the age of reconnaissance satellites and UAVs, the U.S. navy wanted high-altitude jets to be eyes within the sky, and one of the crucial high-flying was the Lockheed SR-71, also called the Blackbird. It managed to exceed 80,000 ft
“With its skill to achieve excessive speeds and excessive altitudes, the SR-71 was used to collect intelligence for the U.S. navy through the Chilly Warfare,” based on the Smithsonian. “The key to the plane’s velocity and agility is essentially in its distinctive engine inlets–a duct the place air in introduced into the engine.”