Longest liquid-fuel-powered drone flight

The Boeing Condor was a high-tech reconnaissance aircraft that first flew on 9 October 1988. With a wing-span of more than 200 feet (60 m), the Condor is larger than either the Boeing 747 or the Boeing B-52 bomber. The Condor was designed for a flight endurance of 80 hours, with its last flight on 28 November 1989 confirmed as being 58 hours 6 minutes 36 seconds (almost two-and-a-half days). It was powered by two 175-hp, six-cylinder opposed, twin supercharged, liquid-cooled Continental TSOL-300-2 engines. In order to fly its missions, on-board computers communicated with computers on the ground via a satellite link. This was ground-breaking technology in the late 1980s. The Condor set an altitude record for a piston-powered aircraft of 67,028 ft (20,430 m) – that's 12.5 miles.

The Condor logged over 300 hours of secret missions before its retirement.