Federal authorities are investigating why a light airplane crashed and burst into flames at Boeing Field Wednesday night.

A 20-year-old student and his 30-year-old flight instructor were practicing takeoffs and landings in their twin-engine Piper Seminole based at Hillsboro, Ore., when it crashed.

The plane veered to the right, slammed into a parked cargo plane belonging to AirPac and ended up upside down.  Their plane then burst into flames.

The two were able to crawl out of the cockpit of the overturned plane while it was burning. 

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• Video: Crash narrowly misses airport terminal

“Apparently there was a large explosion.  There was a fair amount of fuel in the plane on the ground … so it exploded,” said witness Arin Strom.

The plane narrowly missed the terminal.

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Firefighters were called to the east side of the airfield and spread foam to the put the blaze out.  

Seattle Fire Department spokesman Kyle Moore told KIRO 7 Eyewitness News that the two people in the Piper were taken to Harborview Medical Center with cuts and scratches.  

"They’re lucky to walk away after what happened," a medic at the scene told Moore.

Overnight, crews were cleaning up the firefighting foam and anything else that might have spilled on the ramp outside the terminal building.

The  pilot instructor who was onboard is a Salem, Ore., woman, and according to FAA's Civil Aviation Registry,  she is an instructor on both single and multi-engine planes.

It is not known if her student was the one flying the plane when the crash ocurred.

The National Transportation Safety Board is investigating.