Well, just the one in this particular picture, Fulco Ruffo di Calabria, along with a WWI Italian soldier.
I picked these up from Italiankits, from their Allarmi! range of figures.
I haven't spotted anyone mentioning this range yet so I thought I should pass it on.
The Allarmi! range are mostly 1/35 and WWII and, naturally, of Italian subjects.
But they've recently produced a couple of WWI pilots in 1/32 - the other is of Baracca - which are both very nicely sculpted, clearly closely modelled on well known photos of their subjects. As you can see they come with alternate heads. The pilot's box art shows him posed against Roden's SPAD VII. I like them, I hope more will be forthcoming.
Cheers,
Mark