The obvious, that it was "too expensive" like Israel's Lavi program: https://www.thecanadianencyclopedia.ca/en/article/avro-iarrowi-there-never-was-an-iarrowi-f

The obvious, that it was "too expensive" like Israel's Lavi program: https://www.thecanadianencyclopedia.ca/en/article/avro-iarrowi-there-never-was-an-iarrowi-feature https://www.thecanadianencyclopedia.ca/en/article/avro-iarro... But there was the idea that the CIA didn't trust Canada to not sell it to an enemy of the USA. If the Arrow had existed under P. Trudeau, that was a justified fear.