US Aviation Information
For Soaring and Other Sport Aviation Pilots
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Airspace Files (entire US - charting cycle effective June 22, 2017)
These files contain US airspace information for the entire United States, extracted from the FAA's National Airspace Resource data.

You can also get airspace information for smaller regions by requesting a custom airspace companion file as part of an airport information query.

You can follow this link to find files containing US/Canada and US/Mexico border information.

For Hanglider/Paraglider/Ultralight Pilots
These files also contain information for Class E surface areas, Note however that the Class E sources have been marked by the FAA as "BETA - NOT FOR NAVIGATION)".