What is the minimum number of enplanements required for an airport to be classified as a Primary commercial service airport?

To be classified as a Primary commercial service airport, an airport must have a minimum of 10,000 enplanements per year. This classification is important as it differentiates airports based on their passenger traffic and ensures that federal funding and resources are appropriately allocated to support air transportation systems that serve significant numbers of travelers. Airports with fewer than 10,000 enplanements fall into different categories and receive different levels of support and funding. Therefore, the threshold of 10,000 enplanements establishes a clear benchmark for defining the role and significance of primary airports within the commercial air service network.