You never know when an emergency meeting might need to take place. If you're going to have an emergency meeting, you need a suitably well-catered meeting room for it to happen in. This is what you'll find on Air Force One.
It looks like a miniature version of the kind of boardroom you'd find at any high-end Wall Street company, right down to the very comfortable-looking leather chairs. Meetings between the President and foreign dignitaries sometimes happen here, too.