The NTSB also revealed that the crew of the crashed jet had been reassigned to it after their original plane was taken out of service.

Day one of the NTSB hearing on the deadly UPS Flight 2976 crash in Louisville revealed a last-minute plane switch and pylon issues.

The Hawaii-bound jet crashed at Louisville Muhammad Ali International Airport just after takeoff, leaving a massive debris field and flames over a half-mile radius.

José Zozaya and Mark Stevens are breaking down the first day of the NTSB hearing into the deadly crash of UPS 2976

NTSB released shocking video showing a UPS cargo plane engine detaching before a deadly Louisville crash that killed 15 people and injured dozens.

A US safety investigator said United Parcel Service Inc. decided not to take further action after reviewing a 2011 service letter from Boeing Co. that flagged failures of a key structural component in the type of plane that later crashed in Louisville,

Fifteen people were killed after the engine separated from the cargo plane last November in Kentucky.

The NTSB will hold a two-day investigative hearing this week to discuss key questions remaining about the deadly UPS MD-11 crash in November.