Originally Posted by Adam Smith

Since Mikey Mike Mike 's flight seems to be Canada-UK, yes, we can probably set aside th US DOT talk for the moment.

Easiest thing to do is just file a chargeback with the card issuer and cite refusal to refund per EU261 rules. I've already been successful with that (not against AC, but other airlines) several times in this mess. No need to file any EU complaint or anything like that.

Of course, Mikey Mike Mike's flight hasn't yet been cancelled, and unless and until it is, he would be dependent on AC's policy for voluntary cancellations if he chooses not to travel.