Final answer:
To carry passengers and act as PIC, a pilot must have completed a certain number of takeoffs and landings.
Step-by-step explanation:
In order to carry passengers and act as a Pilot in Command (PIC), a pilot must have completed a certain number of takeoffs and landings. This requirement is known as the takeoff and landing currency or proficiency. The exact number of takeoffs and landings required may vary depending on the aviation authority and the type of aircraft. However, as an example, the Federal Aviation Administration (FAA) in the United States requires pilots to have made at least three takeoffs and three landings in the preceding 90 days to act as PIC.