I helped write the Swanwick En Route Short Term Collision Alert System that covers most airports in the south of England about 20 years ago. I primarily use it

I helped write the Swanwick En Route Short Term Collision Alert System that covers most airports in the south of England about 20 years ago. I primarily use it to terrify people who are about to go on holiday. "OOOh you're about to fly through my code!" :D