Michigan airports can receive funding from a variety of sources.

The Federal Aviation Administration (FAA) provides funding to airports that are part of the National Plan of Integrated Airport Systems (NPIAS). The FAA Airport Improvement Program (AIP) is a federal funding initiative that supports airport projects across the U.S. Its primary goal is to enhance the safety, capacity, security, and environmental sustainability of airports. The FAA also has special appropriations such as the Bipartisan Infrastructure Law (BIL) to modernize infrastructure, increase equity in transportation, help fight climate change, strengthen the supply chain, and create jobs. 

The MDOT Office of Aeronautics provides funding to help match federal grants, as well as standalone programs. The state programs include a statewide Pavement Condition Index (PCI) survey, and one-time appropriations for air service revitalization projects (under an air service program) and general aviation airports funding for maintenance, capital development, revenue-generating, and equipment needs (under a state/local program).