The Airport Improvement Program (AIP) provides grants to public agencies — and, in some cases, to private owners and entities — for the planning and development of public-use airports that are included in the National Plan of Integrated Airport Systems (NPIAS). See the AIP Glossary for a description of AIP-related terms.
- Chicago Airports District Office (Illinois, Indiana, Wisconsin)
- Detroit Airports District Office (Michigan, Ohio)
- Dakota-Minnesota Airports District Office (MN,ND,SD)