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If you mean the CW series, they have them. They release seasons after they have aired.

I just checked, and in the US, The Flash, Legends of Tomorrow, Arrow and Supergirl are all on Netflix streaming right now.

You're right about Top Gun, though.

Damn! We don't have them in Australia.

Arrow is on Netflix Australia, as is Gotham, but I think a rival streaming service has the rights to The Flash (Stan? Presto?)

They have all of the DC series, including the ones you mentioned.