Originally Posted by
der_saeufer
The problem with using a UK plug is that it's not uncommon for the outlets on planes used for domestic/Canada/Caribbean service by U.S. and Canadian carriers to have outlets that only fit North American and Continental European plugs.
I'm not sure what planes you've been on for Canadian carriers. But AC and WS planes that I have been on (and aren't propeller types) have all had universal outlets. I can't speak to the propeller ones as I haven't been on them. Maybe not always functioning properly, but they do have them.