"Sami" wrote in message
om...
Are seaplanes still used for commercial purposes , I am talking about
planes with capablity of carrying at least 40 passengers.

How about 17 passengers? Here is a link to an airline that uses seaplanes:
http://www.flychalks.com/mallard/seat.htm In fact, it claims o be the world's
oldest scheduled airline: http://www.flychalks.com/history/airline.htm

If there are
such planes what are their speed compare to Jet Planes (for example
compare to Boeing 767),

Very slow compared to a 767


Vaughn