Suzanne Lee Stepp says she knows that her 47-year-old sister, Sarah, was visiting her boyfriend in Northeast Philadelphia on the night of the medical jet crash.
So, when Suzanne heard news about the incident, she called her sister right away.
"When I called her phone, it went straight to voicemail. She always answers my calls. So, then I called her boyfriend and he said he was worried," Suzanne said.
She said Sarah's boyfriend was worried because Sarah had recently left the house to get a bite to eat in the area where the plane went down.
No one has heard from, or seen, Sarah Stepp since that night.
On Monday, during a news conference with federal, state, and local authorities, officials confirmed that the number of people injured stands at 24, four of whom are still in the hospital.
The number of fatalities remains at seven: six people on the plane and one person on the ground.