Aircraft Carriers. Part-One.

Today there are a number of countries who still use these types of vessels, the U.S.A, UK, France, Brazil, Spain, India, Australia and they seem to be an effective platform for military and humanitarian operations. 

But are they still really viable with the development of more sophisticated kinds of warfare?

It was the British who developed the first carriers, basically ships with a flight deck and a control tower built around the funnel. Today it is the U.S. that leads the world with these powerful islands at sea.