I wonder whose code this was trained on? I guess it's interesting that this is quite a popular search result on Github:
https://github.com/search?q=plane+spotter+language%3AJavaScr...
https://github.com/search?q=plane+spotter+language%3AJavaScr...
This topic has been beaten to death though, and it isn't changing. Companies have little incentive to have explainable AI since it would open them to infringement claims.
At least this person does not fetch all planes and then iterate over all of them but sets boundaries in which area to get all the planes.