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Later Saturday, a helicopter and a gyrocopter collided in midair, killing pilot Mark Peterson, 69, and passenger Thomas Volz, 72.

Two people died and two others were injured after a helicopter and a gyrocopter collided in midair on Saturday at a Wisconsin airport that was hosting an air show, the authorities said.

A Rotorway 162F helicopter and an ELA Eclipse 10 gyrocopter collided shortly after noon local time at Wittman Regional Airport in Oshkosh, authorities said.

The firm hopes to compete in a market occupied by well-advanced rivals, such as AirCar and the Pal-V gyrocopter that are already flying and driving.

The risks of such potential security breakdowns were underscored in 2015, when a Florida postal worker flew his gyrocopter through the same restricted airspace and landed at the U.S.