I need help with the following questions referring to airport operations.

1. An airport is a complex transportation facility designed to serve aircraft, passengers, cargo, and surface vehicles. In summary, describe at least two components that make up an airport?
2. Runways are a critical facility in the airfield's movement area. There are three classifications of runways: Visual, non-precision instrument, and precision instrument. What are the differences between visual, non-precision instrument, and precision instrument runways?
3. What is the difference between pavement maintenance and pavement rehabilitation?