Hit START. Do you see the mission objectives? No? Load the autosave. Keep reloading the autosave until you do see a Mission Update of the objectives when the level starts. Yes, it's just bad programming.
If it ain't Lex "WROOOOOOONG!" Luthor, I'll stop bashing Scarlet Whore for an entire year!!! -- re: villain for next Superman movie
You must rush and save the 3 people you have to save first. Use someone who flies like Ironman or Thor. When you start start to fly to the First person under building debree The second under a bus the Third under some metal. Then it will open up another area in NYC.