In the United States, almost no commercial airports are owned or operated by the federal government. Instead, the vast majority are owned by local or state governments, such as cities, counties, or multi-jurisdictional "Airport Authorities." For example, Dallas-Fort Worth (DFW) is owned by the cities of Dallas and Fort Worth, and Chicago O'Hare is owned by the City of Chicago. These entities manage the infrastructure, leasing space to airlines and vendors. The federal government’s role, primarily through the Federal Aviation Administration (FAA), is focused on regulation, safety oversight, and managing the air traffic control system. The FAA also provides grants for infrastructure improvements through the Airport Improvement Program (AIP), but it does not run the day-to-day operations. One notable exception is the Dulles and Reagan National airports in the D.C. area; while they were originally built and owned by the federal government, they are now operated by the Metropolitan Washington Airports Authority (MWAA) under a long-term lease.