The aircraft that collided in Washington, D.C., were a Bombardier CRJ700 jet operated as American Eagle Flight 5342 by PSA Airlines and a U.S. Army Sikorky UH-60 Black Hawk helicopter.

The Post spoke to several aviation experts about a number of factors that may have contributed to the fatal collision.

The plane, known as Kona, would complement Nolinor's fleet of Boeing 737-200 freighters, all of which are at least 40 years ...