system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How jets time their stadium flyovers perfectly to the conclusion of the national anthem.
gpt
GPS, computers, and radio. They hold station at a certain point, and they've calculated on a computer beforehand how long it takes to get from that point to the flyover point, say, 30 seconds. Thirty seconds before the music ends, somebody on the ground gives them a go and they go.

It should be noted that flyovers cost the taxpayers a shitload of money. A simple one might cost as "little" as $20,000, the more complex ones run upwards of half a million. Superbowl flyover typically run in the $80k-100k range.