system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why would the blackbird fly so high? I looked it up and it says they can fly up to 90,000ft.
gpt
It was a spy plane used for very, very, *very* sensitive operations and the government could not afford to lose them by being shot down or intercepted. So they were designed to fly really fast and really high to help keep them safe.