How many times do I have to tell you? A US aircraft carrier will leave port for the Gulf every six months, about six months after the last one. BTW, the assorted speculation on some of the US blogs about the RN's carriers is risible. The current RN presence in the Gulf consists of two minesweepers, a destroyer, a frigate, and a couple of auxiliaries. I'm not sure Illustrious and Ark Royal are even operational.
Now, what scares me is the French, whose Charles de Gaulle recently arrived in the Arabian Sea. You just don't know what these imperialists will do next!