The number of midair collisions in the United States has averaged 30 per year since 1978, generally involving general aviation aircrafts, but by no means other operators are inmune. In the preceding 12 month period, over 4.000 in-flihght traffic collisions were reported to NASA-ASRS. The following ASRS reports published at CallBack September issue show that the «See and Avoid» principle remains a crucial aspect of collision avoidance in visual conditions


** Midair Collisions : «See and Avoid»
     CALLBACK / Issue 380 – September 2011-
     From NASA´s Aviation Safety Report System (ASRS)