A Midair Collision is a term in Aviation where two aircraft collide while flying. This can be quite deadly, shown in 1996 Charkhi Dadri Mid-Air Collision. There are other serveral examples, including GOL 1907, PSA flight 182 and AeroMexico flight 498.

AeroMexico flight 498 when it hit a Piper PA-28.
AeroMexico flight 498 when it hit a Piper PA-28.