I'm sorry to tell you that whoever told you that it was some 'secret sauce' added in post production either doesn't know as much as they think they do or has been having you on.
What you're seeing in the example images is from an effect called cross-polarisation. It's where light entering the camera has interacted with multiple polarisers. In the images you've used as examples probably polariser on the camera and polarised film on the cockpit glass. The effect occurs primarily in-camera but you don't need a camera if you have a pair of polarised sunglasses.
Photoshop is not involved in creating the effect although the bright colours can be enhanced with it obviously.
It's very easy to do there are various examples of how you can do it at home online.
This ePhotozine article has a write up on how it works for some more detailed background.