List of Space:1999 casualties (including destroyed Eagles).
So 13 destroyed in total, and there were 28 to start with, plus Alan Carter’s.
Plus I don’t recall anyone on Space:1999 ever saying that they couldn’t build more; they had big repair bays too.
But if you want to nit-pick about the realism and continuity of Space:1999, I think you might be able to find one or two other issues…
