LWG wrote:
Shouldn't that be Hotel Alpha Lima Niner Triple Zero?

indeed, my bad, it should be niner

Mxsmanic wrote:
Triple isn't part of the ICAO/FAA phonetic alphabet, as far as I know,
although I imagine some people use it in practice. The British are
very fond of "double" and "triple."

as far as i've seen (then again, i'm just a lowly primary student that
hasn't even soloed yet)
triple is used (at least by the airport's tower and by me/my CFI)
because we report as November triple-three blah blah or November
triple-five blah blah depending on what we're flying