It's having mechanical problems. It just landed a few minutes ago. It looks like the flight will be canceled. At least CO126 doesn't appear to be flying west from Ireland tomorrow (even though you can still buy a ticket on it!). rkkwan talked about it earlier today, post 23 on this thread. It looks like it turned around at the worst possible time: just as the meal was coming to an end and people were ready to sleep. I wonder how the pilot broke the news!

Here's a question: will they have to clear customs and immigration when the plane lands? Add a bit of insult to injury.