Most likely The Flash, as he deserves one the most. He's one of the most well-known JLA members still without a live-action movie (Renaming episodes as movies does not count, DC!)

Thank You But. What About Cyborg?

I dont think Flash and Cyborg are even gonna ever come out

No No No Flash Is Confirmed

And BTW Superman Is Better

Its in development hell

?

No Paused Because Damm Covid-19

They have announced like 75 movies. Not all of them are gonna come out.

No, it had problems long before that. They couldnt land writers or directors and like cyborg (is it still happening?), its on indefinite hold

What about the Trench? I thought that everyone was SUPER excited for that movie! (Sarcasm)