Hval,
You seem to imply that it costs nothing to deploy an air capability to a foreign airfield. It costs millions! Also this deployed unit will require constant re-supply of everything from food to weapons - at great cost. And such land based deployments are not easily set up or dismantled. Once the political and military decision to deploy is made the impact is huge, a Cv deployment can be turned around in minutes - "hard to port coxswain!"