On Sun, 19 Nov 2006 14:54:59 -0800, Externet wrote:
Is a valid pilot license needed to operate an aircraft on tarmac/taxi
way never losing contact with ground ?

No...

Is a valid pilot license needed to operate an aircraft on pontoons
never losing contact with water ?

No...

Depending upon the type of aircraft, you might even be able to fly it
without a license...

--
"Is it possible for the voices in my head to use email from now on?"