Some great ones there, Metallo!
I'm a bit ill, so too lazy right now to get screencaps, but here's the 'text' version.
I also don't know if these necessarily are 'icon' moments, but standout ones that give the essence of the movie imo and/or is also a big moment in the movie.
STM:
The helicopter rescue shot where Supes carries Lois with one hand, and the helicopter with the other.
Runner up:
The long shot of Young Clark racing the moving train with all that joy on his face. (What a concept! Joy in a Superman movie!
)
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SII: Theatrical-
Can't beat the shirt rip.
Runner up:
Supes on the flagpole: 'would you care to step outside?'
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SII: RDC-
The balcony moment with Supes about to leave, Lois in tears. Defining moment where the hero realizes that he'll never have what he wants in life.
Runner up:
Close up of Reeve/Clark pointing at Jor-el, defying his father.
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SIII:
Evil Supes horrified when seeing Clark emerge from him.
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SIV:
Supes standing at the UN podium.... though I wish it were shot in a more powerful way.
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SUPERGIRL:
Of course, the flying ballet (which IS the whole film imo)-