Pilots who safely landed Southwest flight remember moment they knew there was trouble

They described "a large bang" and shaking aboard the plane.

The pilots behind the controls of a Southwest flight that turned deadly in April when an engine failed midair, talked to ABC News recently about the moment they knew there was a problem aboard the plane.

YOU CAN WATCH ABC NEWS' FULL INTERVIEW ON "20/20" FRIDAY AT 10 P.M.

On April 17, Southwest Flight 1380 experienced engine failure about 20 minutes after takeoff from New York City's LaGuardia International Airport en route to Dallas Love Field. There were 144 passengers and five crew members onboard.

"My first thoughts were actually, 'Oh, here we go.' Just because it seems like a, a flashback to some of the Navy flying that we had done," Shults said. "We had to use hand signals because it was loud. And, there was, it was just hard to communicate for a lot of different reasons."

In a letter to passengers obtained by ABC News, Southwest offered sincere apologies as well as a $5,000 check and the promise of a $1,000 travel voucher. The letter also stated that the airline’s primary focus now is to assist the passengers who were aboard the flight in every way possible.