A pilot is officially called "Captain" when they serve as the Pilot in Command (PIC) of an aircraft and hold the highest level of authority and responsibility for the flight. In a commercial airline setting, this transition typically occurs after a pilot has served several years as a First Officer (co-pilot) and has logged a significant number of flight hours—usually a minimum of 1,500 hours to qualify for an Airline Transport Pilot (ATP) license, though major airlines often require much more. Once they pass a rigorous "upgrade" program and a "checkride" with a flight examiner, they earn their fourth stripe on their epaulets, signifying their rank. In a general aviation context, any pilot who is the sole manipulator of the controls and is responsible for the safety of the flight can technically be called the captain of that specific vessel, but the title is most formally recognized in the professional maritime and aviation hierarchies as the ultimate person in charge.