TC, I think you may be confusing AIS with something else. AIS is a marine transponder system. What you see on Planefinder is aeronautical mode S transponder extended squitter. This tends to be fitted only to large fixed wing, although recently it has been fitted to some Ec225 and some S92. Its not fitted to any L2 or L as far as I know, at least not in UK waters.
Edited to add, looks like its fitted to recent S76C and Aw139 as well. Lets say "most helis delivered in the last couple of years"
Last edited by HeliComparator; 30th Aug 2013 at 08:21.