PHILADELPHIA, PA – APRIL 19: Aero Memorial is located in Philadelphia’s Aviator Park on April 19, 2013. The memorial is a tribute to those aviators who died in World War I – Kelleher Photography Store PHILADELPHIA, PA – APRIL 19: Aero Memorial is located in Philadelphia’s Aviator Park on April 19, 2013. The memorial is a tribute to those aviators who died in World War I – Kelleher Photography Store