https://en.wikipedia.org/wiki/Flight_Control_(video_game)
The other game that influenced the design of ATC is "Sector 33". In this game, players had to do a little bit of math using the speeds and distances of planes to coordinate their approach to an airport.
https://www.nasa.gov/centers/ames/Sector33/iOS/index.html
Ideally, I'd like to combine the colorful art style and casual randomness of Flight Control with the simple arithmetic of Sector 33. I want to make it interesting for players to watch their creation play the game, and give them a sense of accomplishment when multiple aircraft land in perfect intervals one after the other.
Here is a little bit more background about the inspiration for the game in case you want to know more: https://www.jdno.dev/auto-traffic-control/
There was quite a bit of SEO spam to work through as it seems they let the domain lapse and it was bought up, but this seems to be the general ballpark of when it was live: https://web.archive.org/web/20081223024015/http://www.kenned...
For some reason Wayback didn't hyperlink the actual download, but updating the URL will return it: https://web.archive.org/web/20081224105001/http://www.kenned...