Passengers on a United Airlines plane got a shock when an evacuation slide deployed during the flight, filling part of the cabin.

Traveller Mike Schroeder said he was flying from Chicago to Orange County, California, when he heard a hiss and pop. He says he turned around and saw the plane's emergency evacuation slide inflating inside the plane.

The plane made an emergency landing in Kansas but Mr Schroeder said passengers remained calm and took pictures of the odd sight with their phones. He said the pilot announced he had never seen it happen before.

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