Actually very easy.
Call the airports from which planes took off and say that you have placed bombs in these airports and then say that you're Al Qaeda and are planning terror acts involving planes in future too.
This would alert aiport security, airports would be shut off and seached and CIA would in future, hopefully, take more care towards who is boarding planes.
Additional calls to police regarding bombs placed in WTC buildings and Pentagon would also help to stop the tragedy.
The issue is, you don't want to send information to FBI or CIA that you have knowledge that Al Qaeda is planning something, cause nobody will care. You have to act like a terrorist, call police, read from Quran or just call everybody infidels and say that America will pay bloody price yadda yadda like Mandarin from Iron Man 3 and say that Sheik Osama bin Laden has asked you have placed explosives there and there. From personal experience, a thing like that shuts down airports for hours.... ok maybe it's just like that now, but even then any bombing threat would be taken seriously and terrorists would probably cancel the plan due to confusion of what's going on.
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