system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the job of the air mashal? It seems most planes in movies have one, is there one on every flight?
gpt
Air Marshals are basically the police on airplanes. Most planes don't have one. You (probably) won't know if they are on your flight or not.

I've been told that it is really a grueling and boring job. Marshalls fly on average 2-3 flights per day, and the majority of the time they are never needed or called upon. It's not what most people who signed p to be marshalls had in mind.