Advertisement 2 Story continues below This advertisement has not loaded yet, but your article continues below. Try refreshing your browser, or Donald Trump threatens Canada with 50% tariff on aircraft sold in U.S. Back to video We apologize, but this video has failed to load. Please try againArticle contentAdvertisement 3 Story continues below This advertisement has not loaded yet, but your article continues below. Article content “Further, Canada is effectively prohibiting the sale of Gulfstream products in Canada through this very same certification process. Article content “Aircraft certification, especially between Canada and U.S., has always been very close with Canadian authorities and the FAA (Federal Aviation Administration) in unison,” Aimer said.