Fred, I think Sunwing may be changing either the carrier or the flight times, because today (on their site anyway), they don't show you the flight details anymore, not even the carrier.
Yesterday (or sat. can't remember which), they showed Cubana
Now the Skyservice ones truly puzzle me. All their flights via Cayo Coco are a total of 7 hours :)
Edit to this post: it was on the return flight that we stopped in Cayo Coco not the trip down, but still it was a total of something like 5 hours return, not 7. The flight down was accomplished in less than 4.
Oh and Sunwing is definitely using Cubana again. The flight times and carrier are posted again. Just checked :)