system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the United Airlines CEO testifying before the US Congress?

I'm curious what the US government has to do with the dragging incident.
gpt
Airlines are subject to all sorts of regulations and policies enacted by laws Congress creates, enforced through the FAA, etc. When incidents like this occur, then Congress wants to investigate what happened and why, and see if they need to clarify existing rules & regulations or add new ones to prevent similar incidents.