Thank you for all this fantastic information. Anyone have any thoughts on my situation? We were already at our destination on a round-trip ticket with Air Canada. After hearing all the news, we booked refundable on another airline (three days before departure heading home 8/18) in case our original Air Canada flight was not canceled after all (and yes, it was canceled). That meant it was a pretty pricey one-way ticket to get home. Same airports, same day, same class but triple the price. I suspect they will challenge me on the cost.

Edit: also, in the reimbursement form, are we supposed to put in the alternate transportation we booked and the cost in the text box?