Pilots
You wouldn't get very far on a flight without pilots: They're the people who put all that sophisticated equipment to work. On commercial airlines, there are always at least two pilots, and on many flights, there are three. All airline pilots have had extensive training and flying experience, often as part of military service. The road from the first training flight to the airline cockpit is a long and difficult one, but for many pilots, this is the only way to go. To learn more about this career path, check out How Becoming an Airline Pilot Works.
On an airliner, the pilot in command is called the captain. The captain, who generally sits on the left side of the cockpit, is ultimately responsible for everything that happens on the flight. This includes making major command decisions, leading the crew team, managing emergencies and handling particularly troublesome passengers. The captain also flies the plane for much of the trip, but generally trades off with the first officer at some point.
The first officer, the second in command, sits on the right side of the cockpit. He or she has all of the same controls as the captain, and has had the same level of training. The primary reason for having two pilots on every flight is safety. Obviously, if something happens to the captain, a plane must have another pilot who can step in. Additionally, the first officer provides a second opinion on piloting decisions, keeping pilot error to a minimum.