Everyone has been using sentiment analysis for a while with any recorded call with executives. Frankly it’s often not exceptionally helpful and having longer duration knowledge about a company and its executives can be better for understanding when something in their posture changes. The fun alternative analyses I’ve heard of are when people start tracking executives’ travel to see who they’re meeting with.
Hey, we used to do that one, too! ACARS data to see which executives were golfing together. It's hard to figure out who is buying whom, though. It's more useful for pure entertainment. The only way I actually made returns from CEOs on airplanes was when one happened to sit next to me on a commercial flight and proceeded to edit a powerpoint with "BUY XYZ CORP FOR $M.N BILLION" in 100-point bold letters on his gigantic laptop.