Here is a photo of a standard PSA Airlines Bombardier CRJ700 series regional jet ... seated troops in combat," according to Lockheed Martin, the weapons company that builds the helicopter.

The twin-engine, four-blade helicopter is manufactured by Sikorsky, a subsidiary of defense contractor Lockheed ... in May 1999.Bombardier said in 2015 that the CRJ700 series accounted for 20% ...

Here are images of the two aircraft involved in the crash, taken from airline websites and directly manufacturers.