Two small planes, a Cessna 172 Skyhawk single-engine and a twin-engine Piper Cheyenne, are collided in the evening of Friday for causes still disowned while they flew on the city of Denver, Colorado's capital. There were two people for each aircraft at the moment of the impact, who have immediately lost the lives, while other 7 persons on the ground, among whom a 2 years child, were hurted when the...