MIAMI — An Amazon Prime Air cargo jet was still moving at about 129 mph when it ran off a Miami International Airport runway, crossed a perimeter road and struck vehicles, killing five people and injuring five others on a busy Labor Day weekend afternoon.

The Boeing 767-300 freighter, Prime Air Flight 7598, arrived from San Juan, Puerto Rico, and overran Runway 30 around 2 p.m. Sunday. Tracking data compiled by Flightradar24 put the jet at 112 knots — roughly 129 mph — as it left the usable pavement. Miami-Dade Fire Rescue Chief Ray Jadallah said five people died, three were taken to a trauma center in critical condition and two others were hospitalized with less severe injuries. Officials had not said by Sunday night whether the dead were in the cockpit, in cars on the road, or both.

The National Transportation Safety Board sent a go-team led by Chair Jennifer Homendy and scheduled the agency's first public briefing for Monday. Investigators are expected to start with a simple question captured on video and flight tracks: where the airplane touched down, and why the crew did not abandon the landing if the jet floated past the normal zone.

Aviation safety specialist Steve Arroyo said the typical touchdown area is within the first 3,000 feet of a runway. If the cargo jet was beyond that, he said, the pilots should have gone around. Mary Schiavo, a pilot and former inspector general of the Transportation Department, said online video showed the Amazon plane remaining airborne well down the strip without the usual flare that puts the main gear on the........

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