When the flight’s engine blew on Tuesday and a window shattered, 149 passengers and crew members strapped on oxygen masks and waited as pilot Tammie Jo Shults steered them toward Philadelphia for an emergency landing.

For most people, the experience was filled with uncertainty as debris swirled down the aisle of the Boeing 737 and gusts of wind made it difficult to hear. But for Mackey, a University of Oklahoma professor, there was nothing uncertain about what happened to Jennifer Riordan, the only person who died.

Mackey said she was in seat 14C and Riordan, a bank executive from Albuquerque, New Mexico, was in seat 14A, a window seat.

Between them sat a young girl — she looked primary school age, though Mackey noticed she was smaller in size.

“I had clicked my seat belt back on and I was going to get something out of my bag. And then there was a big boom, and we were all very confused for a second. Just at the same time, there was a boom and this cold air and this sucking sound. We were all just looking around.”

When the window blew, Riordan’s upper body was pulled out of the plane. Mackey said she and the child tried but failed to bring Riordan back in.

“The little girl with her itty bitty hands tried to help me,” Mackey

told KTVQ.

“I had leaned over and grabbed on to her belt loops and her waist and wrapped my arm around her waist and tried to pull. And the little girl next to me also tried to pull with me, and we tried to pull her back in, and we couldn’t. We were not strong enough. All we could do was stay calm, because if we didn’t then there would be even more panic in the plane.

When the two couldn’t pull Riordan back into the plane, Mackey said, they just waited with her. “All we knew we could do was stay with her and get her home,” she said.

To Mackey, it was a “godsend” when fellow passengers Tim McGinty and Andrew Needum tugged Riordan’s body back inside the cabin.

Needum, a Texas firefighter, said he heard commotion behind him and his wife nodded that it was OK to leave her and try to save Riordan. He refused to provide details about his rescue efforts out of respect for Riordan’s loved ones.

“I feel for her family,” Needum said. “I feel for her two kids, her husband, the community that they lived in.” Mackey said she and others are experiencing survivor guilt, especially because the airline allows passengers to pick their own seats.

“Why do we choose the seats we choose?” she asked. “Psychologically, I think there’s a lot going on.” Mackey criticised some media outlets for oversimplifying the rescue efforts, when, she said, amid the chaos, the situation was far more complex. “A lot of people,” she said, “made a lot of really difficult decisions.”