Looks like an Antonov An-124 will be visiting Moffett Field sometime in late May.
Volga-Dnepr - Mountain View (Moffett Field)-NASA Shuttle Landing Facility, Titusville, FL Emergency Exemption Amendment: airlineinfo.com/ostpdf101/73…

May 3, 2018 · 8:23 PM UTC

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Replying to @davidbaron
It flies into Moffett fairly regularly (every month or two?), or at least that's about how often I see it flying over.
Replying to @davidbaron
An-225 or bust.