Just for kicks, checked out Spirit today for our Feb. trip. They are only booking up to Dec. 18. So along with JetBlue, who also are not yet booking in Feb., I will have to wait for a couple more months to check both airlines. But I have checked Spirit in past years from DTW to SXM, and they were only a few dollars cheaper than AA, so by the time you added in luggage and other amenities it was the same or more. And it is only 2-1/2 hours from Port Huron to Toronto, where it is 3-1/2 hours to Cleveland, so it looks like Toronto is still our best bet. But I want to thank everyone who posted suggestions.