When you click on the small info button the second paragraph says "Visit paperplanes.world on your computer to throw planes into your screen". Is this actually a working feature? I did try it and it actually seems like a plane with the same colour appeared shortly after I launched it with my phone. That might still be coincidence though since there are a lot of planes.

edit: I've tried it about 20 times or more now, and I'm pretty certain that it actually works. I'm guessing all planes that are being launched at the moment are displayed live with their correct colour?