The midair collision Wednesday night between a regional American Airlines passenger jet and a Black Hawk military helicopter over the Potomac River near Washington, D.C., was "absolutely" preventable,

Sixty passengers and four crew members from the plane and three Black Hawk helicopter personnel are feared dead as a recovery mission is underway.

Families and friends of those who lost loved ones in the deadly American Airlines and Army helicopter collision are sharing tributes online in memory of the crash victims.