Stowaway — Ride along with anything in the sky

Pick any aircraft or satellite passing over your house right now, and go sit in its window seat. The sky here is the real one outside — your location, your weather, this minute's light — with the aircraft and satellites that are genuinely overhead. Click one and the camera follows it; stow away and it takes a seat on board, over real terrain. All of that is drawn in real time, which needs JavaScript and WebGL 2. Switching JavaScript on for this site should do it.