blwblw, I agree we would also call it "aircraft'' because that is the proper term, but I'm just talking about slang terms because thats what I'm comparing, overall it was mostly "tail number" or "aircraft" then "plane" as in "go do preflights on all the planes" then sometimes you'd here "helo" but never "heli." I guess this is pretty much a useless topic...to each his own.