Air Canada does not appear to be cancelling flights as of yet. They are allowing for a change of ticket for free with some conditions of course. I'm not the biggest fan of Air Canada in general, but I have to give them credit for still flying to Israel. Granted maybe this just shows the evident mood of two different governments, Canada, who stands 100% behind Israel, and the US whose president and Secretary of State aren't so much. Politics aside, there are still options for those who want to go to Israel. And with Air Canada being a Star Alliance member, it may be possible for people to change their tickets to fly through Toronto for those on United. Other alliances also have flight possibilities. But based on the info you'll now have to connect if you want to fly from US to Israel.