The energy-efficient liquid-hydrogen powered Phantom Eye's maiden flight was held on June 1 at NASA's Dryden Flight Research Centre at Edwards Air Force Base, California.
"This day ushers in a new era of persistent Intelligence, Surveillance and Reconnaissance (ISR) where an unmanned aircraft will remain on station for days at a time providing critical information and services," said Darryl Davis, president, Boeing Phantom Works.
"This flight puts Boeing on a path to accomplish another aerospace first -- the capability of four days of unrefuelled, autonomous flight," Davis said.
The first flight of the unmanned aerial vehicle (UAV) lasted 28 minutes and the Phantom Eye reached an altitude of 4,080 feet (1,244 metres) and a cruising speed of 62 knots.
The autonomous aircraft, with its 150-foot wingspan and powered by energy efficient liquid hydrogen, completed its first take off and landing June 1, Boeing said in a statement.
However, after touching down, the vehicle sustained some damage when the landing gear dug into the lakebed and broke, it said.
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Phantom Eye brings a new level of high altitude long endurance (HALE) to the aviation world. It's efficient and environmentally responsible liquid-hydrogen propulsion system is a first of its kind, creating only water as a byproduct of its engines. The aircraft can also carry a 450 pound (204 kg) payload, the company said.
"This flight demonstrated Phantom Eye's initial handling and maneuverability capabilities," said Drew Mallow, Phantom Eye programme manager for Boeing.
The CIA use armed drones regularly to target militants in countries like Pakistan and Yemen. For example, Al-Qaeda's second in command Abu Yahya al-Libi was the main target of the US drone strike that killed 15 militants in Pakistan's lawless Northwest yesterday.