what the fuck. what the fuck how. how the hell.
“how the hell” is the fact that flight paths are ENTIRELY PRE-PROGRAMMED AND SCHEDULED. This is trivial.
“Technology has gotten so precise that it is possible to sync the image on an enormous video screen with the movements of an actual, real life, giant flying machine carrying hundreds of human beings thousands of meters up into the air. This is trivial.”
It’s absolutely not trivial, because it means that a flight somehow took off when scheduled.
Actually, it doesn’t. Positional data on flights is available globally in real time. Here’s a couple of sites that do that:
https://www.flightradar24.com/
The logic in the billboard might just have a radio that listens for available ADS-B data on nearby planes (ADS-B can send the flight number and GPS position) and does this for the appropriate British Airways flights