Jennifer Riordan, a 43-year-old bank executive and mother of two from Albuquerque, was seated in row 14 when she was sucked through a 10-by-14-inch window that had been broken by pieces of the disintegrating engine, two individuals familiar with the investigation said.
When the two couldn't save Ms Riordan, Ms Mackey said, they just waited with her.
The US Federal Aviation Administration (FAA) and European Aviation Safety Agency (EASA) each issued an emergency airworthiness directive Friday requiring airlines to perform an ultrasonic inspection of certain CFM56-7B engines.
Under the FAA order, all CFM 56-7B engines that have gone through at least 30,000 flights during their lifetime must be inspected within 20 days.
Signs of metal fatigue were found where the fan blade separated from the engine.
The NTSB will look into how an interior crack on a fan blade could have led to the engine failure.
With a total of more than 8,000 of the engines now in use on both commercial and military aircraft, the engine is considered one of the safest and most efficient in the world.
Once the inspections are completed, CFM recommended to repeat the process every 3,000 cycles - about two years in airline service - but the FAA did not require such a measure. The plane, en route to Dallas from NY, made an emergency landing in Philadelphia.
The agency says its order affects 352 engines in the US and another 681 worldwide on "new generation" Boeing 737 jets.
Yechury re-elected to helm CPI-M, vows to oust Modi government
Outside parliament, we should cooperate with all secular opposition forces for a broad mobilization of people against communalism. He also rejected the argument that no major changes were made in the resolution.
The FAA said it will consider ordering expanded action "as we learn of additional information from this most recent incident".
"The public should be anxious (because) a manufacturer sent out a warning, and Southwest and others didn't do it", said Mary Schiavo, a former inspector general of the Transportation Department, FAA's parent agency.
U.S. aviation officials have ordered emergency inspections of hundreds of airplane engines just days after a woman died on a Southwest plane that suffered an engine explosion. "Our hearts are heavy", the pair said. Southwest said it expected to wrap up its inspection of the engines it was targeting in 30 days.
CFM, jointly owned by General Electric and France's Safran, also recommended inspections by the end of August for fan blades with 20,000 cycles, and inspections of all other fan blades when they reach 20,000 cycles. Each CFM56 engine has 24 blades.
Sumwalt said he could not yet say if the incident, the first deadly passenger airline accident in the United States since 2009, pointed to a fleet-wide problem in the Boeing 737-700.
Robert Sumwalt, chairman of the NTSB, said the risky kind of engine breakup that occurred Tuesday - called an uncontained failure because pieces were shot out like shrapnel - should not have happened. There are now about 14,000 CFM56-7B engines in operation.
The engines that must be inspected are manufactured by CFM International.