What does the Contract Tower Program primarily relate to?

The Contract Tower Program primarily relates to public use, National Plan of Integrated Airport Systems (NPIAS) airports. This program involves the use of contracted air traffic control services at smaller airports that do not have the volume of traffic or the operational complexity to justify a full-time government-employed air traffic control tower.

By focusing on these types of airports, the Contract Tower Program aims to enhance safety and operational efficiency at facilities that support general aviation as well as limited commercial operations. The inclusion in the NPIAS reflects the federal government's recognition of these airports' importance in the national transportation system, even if they may not have the same level of traffic as larger regional or major airports.

In contrast, general aviation flight rules pertain to the regulations that govern non-commercial aviation operations, aviation weather systems are crucial for safe flight operations but do not directly pertain to tower operations, and runway safety measures are vital for overall airport safety but do not define the scope of the Contract Tower Program itself.