Reading 91.129 regarding Class D ops and establishing communications, (c)(1) mentions: "including foreign ATC in the case of foreign airspace designated in the United States"

Can anyone point to an example of such airspace?

Ref.: https://www.gleim.com/aviation/faraim/index.php?leafNum=91.129


1 Answer 1


The Sault Ste. Marie Airport (CYAM) is a Canadian airport with Class D airspace that extends into US territory:

Screenshot from Skyvector of a portion of the Lake Huron VFR sectional chart, depicting the Class D control zone around Sault Ste Marie airport (a portion of which covers US territory) Skyvector

  • $\begingroup$ The chart there shows the atc boundary running through the class D. Do you know how that is managed? $\endgroup$
    – TomMcW
    Commented Oct 19, 2021 at 20:05
  • $\begingroup$ @TomMcW I would assume that the tower would be able to take handoffs from both ARTCC/ACC facilities, but I don't know for sure. $\endgroup$ Commented Oct 20, 2021 at 4:50
  • $\begingroup$ @TomMcW also possible: the airspace boundaries have different altitude restrictions, which would also deconflict. $\endgroup$
    – jwenting
    Commented Oct 20, 2021 at 8:46

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