Once upon a time, it was 'Oh look, there's a plane overhead'—now it's, 'That's a Qantas plane, flight QF402, it's doing 700 mph at 35,000 feet. It came from Sydney and is headed to Singapore.' Yes, that was made up, but it gives you an idea of what a flight tracker can do. You can see exactly the same on the screen in front of you. Flight tracking apps and websites has changed the way we view the fast-moving dots in the sky.