Map showing the two North American Air Defense Identification Zones, the Contiguous U.S. ADIZ and the Canada ADIZ.
<a href="https://en.wikipedia.org/wiki/National_Geospatial-Intelligence_Agency" class="extiw" title="w:National Geospatial-Intelligence Agency">National Geospatial-Intelligence Agency</a>
<a rel="nofollow" class="external text" href="https://www.columbus.af.mil/Portals/39/documents/New%20Students/IFR_BOOK_13SEP18.pdf">DoD Flight Information Publication (Enroute) - IFR Supplement United States</a>