Based on community feedback and official support documentation, here are the most common reasons you're seeing this error when trying to launch I am an Air Traffic Controller 4 :
: Head to the Official OpenAL Website or check the game's internal _CommonRedist folder within Steam. i am an air traffic controller 4 application not found top
Select , then navigate to the Installed Files tab. Click Verify integrity of game files . i am an air traffic controller 4 application not found top