The infrared part of the navigation system projects a green image of the terrain on to a screen in front of the pilot.

BBC: News | In Depth | Military Fact Files

Steady advances in automation and robotics are now invisibly encapsulated in navigation, weather avoidance, traffic management, flight controls, safety and communications aids that materially benefit the two-pilot front cabin.

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But it will seat only four--two up front, including the pilot, and two in back.

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The jet carried a student pilot in the front seat and an experienced instructor behind him, and the leakage of jet fuel was "one of the indications that there was a mechanical malfunction, " Navy Capt.

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California's XCOR Aerospace also is developing a reusable vehicle that will take a pilot and a front-seat customer to the edge of space -- for pleasure or to transport scientific payloads that would benefit from microgravity.

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The company is in the middle of a pilot program that puts its learning platform in front of students from New Mexico, Connecticut and Pennsylvania and so far results have been compelling, co-founder Ashish Rangnekar said.

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In a nondescript building, down a largely unmarked hallway, is a series of rooms, each with a rack of servers and a "ground control station, " or GCS. There, a drone pilot and a sensor operator sit in their flight suits in front of a series of screens.

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