The impact area where a medical plane crashed in Philadelphia was notably “expansive,” U.S. Transportation Secretary Sean Duffy said Monday after viewing the site.

A Philadelphia father is calling his son a “superhero” for shielding his younger sister when a medevac jet crashed in a Philadelphia neighborhood, showering flames and debris on homes and the vehicle in which the family was riding.

Following Sunday's recovery of the black box from the Roosevelt Blvd. crash site, officials say the NTSB's report could be expected in about a month.