Private Pilot License
Pilots are required to go through many hours of flight training and theoretical study, that differ depending on the country. The first step is acquiring the Private Pilot License (PPL), or Private Pilot Certificate. This takes at least 40 hours of flight time with a Certified Flight Instructor (CFI).
The next step in a pilot’s progression is either Instrument Rating (IR), or Multi-Engine Rating (MEP) endorsements.
Commercial Pilot License
If a professional career or professional-level skills are desired, a Commercial Pilot License (CPL) endorsement would also be required.
To captain an airliner, one must obtain an Airline Transport License (ATPL). Now, even when being a First Officer (FO), an ATP is required.