What does the National Transportation Safety Board look for in a plane crash investigation? A flight expert explains.

The Federal Aviation Administration said the Learjet 35A veered off the runway as it arrived at Scottsdale Municipal Airport around 2:45 p.m. It hit a Gulfstream 200 business jet that was parked on private property, officials said at a news conference.

At least one person is dead and three injured after a small business jet crashed into a parked plane as it arrived at Scottsdale Airport in Arizona, just east of Phoenix, on Monday afternoon.