A day after an Azerbaijani airliner's crashed in Kazakhstan, aviation experts say the plane most likely went down after being hit by Russian air defense systems. Here are some things to know about the crash that killed 38 out of the 67 people on board ...

After an Azerbaijan Airlines jet crashed in Kazakhstan, speculation mounted about why the plane went down and whether possible Russian air defense action may have played a role.

The damaged plane was denied permission to land at any Russian airports, despite requests from the pilots, and was directed to continue across the Caspian Sea towards Aktau, Euronews reported.