The craft, seen hidden under a cloth, is believed to be a radical new craft using electric 'hairdryer' to allow it to land and take off vertically.
The aerospace giant's defence arm teased the new craft, covered in a black cloth.
It is believed to be a radical new craft using electric 'hairdryer' to allow it to land and take off vertically.
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Boeing will unveil their mystery aircraft on December 19th.
Speculation has so far said it could be anything from a new spaceplane to an electric fighter jet.
Earlier this year Boeing bought Aurora Flight Sciences Corp, which is developing the autonomous, electric-powered and long-flight-duration aircraft for its commercial and military businesses.
Last year, Aurora won a contract for more than $89 million for the vertical take off and landing X-plane, beating Boeing in the process.
Boeing's Phantom Swift: The design leverages two large fans buried in the aircraft's fuselage to provide vertical lift and a pair of swiveling wingtip fans for stability and control during hover and for propulsion during forward flight.
Earlier this year, the first prototype of the LightningStrike, Darpa's vertical take-off and landing experimental aircraft project took to the air - and many of its capabilities could be in the new craft.
The radical design combines fixed-wing technology from planes with rotary-wing technology from helicopters.
It has two large rear wings and two smaller front canards, short wings mounted near the nose of the aircraft.
BOEING'S SECRET SPACEPLANE
The mysterious X-37b spaceplane has captured the imagination of many, with some suggesting it is a spy plane and others who think it could be a space bomber.
But now its big brother is one step closer to being built.
The project, known as XS-1, is expected to debut in 2020, and military bosses claim it will 'bolster national security by providing short-notice, low-cost access to space.'
The engine would drive 24 ducted fans, nine integrated into each wing and three inside each canard.
Aurora, the firm behind the radical craft, previously told Defence One 'there's quite a bit of interest' in a laser-armed version of the drone, particularly for use in Marine Corps missions.
Aurora Flight Sciences said the subscale version proved the radical theory behind the craft.
The subscale aircraft weighs 325 pounds and is a 20% scale flight model of the full scale demonstrator Aurora will build for Darpa in the next 24 months.
Boeing, meanwhile, was developing its own VTOL, known as Phantom swift - and the new craft could be a hybrid of them both.
BOEING'S PHANTOM SWIFT
Boeing's Phantom Swift was a Boeing Phantom Works program that was being developed for the Defense Advanced Research Projects Agency (DARPA) under the VTOL X-Plane competition - but was ultimately beaten by Aurora's entry.
The design leverages two large fans buried in the aircraft's fuselage to provide vertical lift and a pair of swiveling wingtip fans for stability and control during hover and for propulsion during forward flight.
The idea is to have one or two General Electric CT7-8 turbines produce power to drive all these fans electrically, although an early prototype might not include a full hybrid electric drive system.
Boeing says this configuration is far more efficient than a normal helicopter and DARPA's original design goals included hitting speeds beyond 300 knots and carry 4,000lbs.
The design leverages two large fans buried in the aircraft's fuselage to provide vertical lift
The deal could face regulatory obstacles, but the company hopes to complete the purchase this year, Hyslop said.
THE AURORA 'HAIRDRYER' SPECS
Aurora, the firm recently bought by Boeing, was developing a radical 'hairdryer' VTOL that could form the basis of the new craft.
It can:
- Achieve a top sustained flight speed of 300 knots (556 km/h) to 400 knots (741km/h).
- Raise aircraft hover efficiency from 60 per cent to at least 75 per cent.
- Present a 'more favourable' cruise lift-to-drag ratio of at least 10, up from 5-6.
- Carry a useful load of at least 40 per cent of the vehicle's projected gross weight of 10,000-12,000 pounds (4,500-5,444kg).
- Perform flight tests in 2018
Boeing will maintain Manassas, Virginia-based Aurora as a separate unit reporting through Boeing's engineering, test and technology division, which is headed by Hyslop.
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