The FAA pilot certificate ladder
The FAA arranges pilot certification as a hierarchy of increasing privilege and required experience. A student pilot may fly solo only with an instructor's endorsement and carries no passengers. A sport or recreational certificate adds limited privileges with fewer hour requirements but tighter restrictions on aircraft and airspace.
The private pilot certificate (PPL) requires a minimum of 40 flight hours under Part 61 and allows carrying passengers, but not for compensation. It is the foundation most career pilots build on.
Commercial and ATP levels
The commercial pilot certificate requires a minimum of 250 hours under Part 61 and permits flying for hire. An instrument rating, usually earned alongside or before commercial, allows flight in instrument meteorological conditions by reference to instruments.
At the top is the Airline Transport Pilot (ATP) certificate, the prerequisite to act as captain for a scheduled airline. It generally requires 1,500 total flight hours, a threshold raised after the 2009 Colgan Air crash, with reduced minimums available for qualifying military and collegiate-program pilots.