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

But for Alice... Bar-Yohay: We're roughly at 60% of maximum takeoff weight, meaning 60% of the plane when it takes off is battery. It's the same when it lands; we don't lose anything. Narrator ...

A small plane crashed ... as it was taking off. CBS News Philadelphia was told the plane was doing practice take-offs when the crash happened. Police said two people inside the plane were injured ...

A young figure skater on the US team who had been on the American Airlines flight that suffered a collision with a Black Hawk ...