The Federal Aviation Administration has ordered inspections of fan blades on some jet engines of the same type as the one that blew apart on a Southwest Airlines flight, causing the death of a passenger and injuring seven others.

Meanwhile, Philadelphia's medical examiner says Jennifer Riordan, who died on the Dallas-bound Boeing 737 flight, was killed by blunt trauma to her head, neck and torso when she was partially blown out a cabin window shattered by engine debris. Federal inspectors say Riordan, 43, was wearing a seatbelt at the time of the accident.

When Lane Murdock, a high school sophomore, heard that 17 high school students and educators had been killed in a shooting in Parkland, Fla., she says she felt numb.

To her, and so many others, mass shootings can feel all too common in the U.S.

"In the time I've been in high school we've had the Pulse, Las Vegas and now, [the Parkland] shooting," Murdock says.