I'm pretty sure that Kodak is the only manufacuter of this film; I can't imagine why they'd discontinue it.
They still manufacture Aerochrome III IR, which is a C41 fil, though I'm not sure if it's available in 70mm; I've only heard of it in 135 and 120.
I don't know of any other companies htat make htis (at least in the US), but that certainly doesn't mean that they aren't out there. All literature about CIR photography seems to only mention Kodak's film. With AGFA, Ilford and Konica-Minolta discontinuing their IR B&W films, I think that Kodak & Maco are the only IR film-makers out there, but hte Maco stuff is only B&W ... (And as Kodak is discontinuing their films, Maco is introducing a new one, what does that tell you ...)
<rant>It's really too bad what Kodak's doing to their film line, and the marketing people are going to be kicking themselves in hte face 10 years from now when they realize that the film market really was important, and that many people still do want to buy it. Discontinuing a professional aerographic film seems especially stupid, as there will always be a demand for it, or at least until digital aerial photography becomes cheap and capable of producing the quality and resolution capable with film. The Kodak people seem to forget that Kodak is wher e it is today becuase from the beginning, it was North America's pioneering film manufacturer ... </rant>
anyway ...