This is the same problem as the Avengers. Where was the Avengers when Thor was fighting aliens in the UK? Where was the Avengers when the president was kidnapped in Iron Man 2? Where was the Avengers where helicarriers are dropping out of the sky in Winter Soldier?
It's things like that when you just gotta suspense your disbelief and realize that if the Avengers or Justice League shows up for everything. There wouldn't be any solo movies or movies about other teams.
Except you could easily explain the situations in the Marvel movies.
Thor 2 - the climax is like all of 10 minutes and it's unlikely any of those cast members has Tony or SHIELD on speed-dial. Does Thor even know how to use a phone?
Iron Man 3 - Rhodey tells Tony near the start of the film that the government looked helpless during the alien invasion, so they want to seem capable in the public eye by dealing with the Mandarin. And by the time the government even learns of something going bad with Air Force One and the President, it's pretty much only acouple hours until climax-time anyway. When they do inform the Vice-president, he does nothing because he was in on it the whole time.
Winter Soldier - Cap can't call anyone for help since all channels are being monitored. And even if they saw what was happening on the news, who's to say they would have been there in time to do anything?
Ultimately these are all excuses for "Marvel didn't sign that contract," but even so, these explanations atleast work within the fiction.