The Airport Improvement Program (AIP) airport grant program funds airport infrastructure projects such as runways, taxiways, airport signage, airport lighting, and airport markings. The grants strengthen our nation's aviation infrastructure.
Airports are entitled to a certain amount of AIP funding each year, based on passenger volume. If their capital project needs exceed their available entitlement funds, then the FAA can supplement their entitlements with discretionary funding.
The map data is also available as a table (PDF).