Wiki has basic info but consulting Dr. Google will prove fruitful.
If they simultaneously detonated nukes over the precise locations necessary to shut down the electric grid they could impact the whole nation just as if it was a big EMP attack. Actually probably even more effectively because they could hit Texas at the same time as everybody else; IIRC Texas has its own separate grid.
I’m told that around the same time as a nuke was shipped from NV to the east coast where an insider said it was supposed to be detonated over Charleston(?) but was instead dropped into the Atlantic and detonated (and the people who oversaw that process were axed shortly thereafter)... about 8 nukes went “missing” from TX. Sort of how the Manpads, planes, etc went “missing” from Libya, perhaps with a little help from the communist wing of the CIA - perhaps enabled by Brennan’s NSA snooping on David Petraeus which perhaps allowed Brennan (the commander of the communist/Islamist wing of the CIA) to call the shots in Benghazi while Petraeus took the fall for it...
If the insider is correct and Obama intended to detonate a nuke over Charleston but found that his military leaders were too patriotic to go through with it, then perhaps the 8 nukes going “missing” from Texas were a way to get the nukes to Mexico where the Holder-armed cartels are working with Islamist terrorists to try to get access to America.
Get those planes together with those nukes and the terrorists have exactly what they need, to destroy America.
Take off from a country that sympathizes with them - like maybe Venezuela, which has ALREADY shown its willingness to let Hamas and Hezbollah operatives into their country on UNCHECKED flights. IOW, Venezuela’s aviation system already seems to have worked with the Islamists. So planes take off from Venezuela and head in different directions to different US destinations. The Venezuelan FAA hands these planes off to US FAA with authorizations as if everything is fine, the planes go to the cities they say they’re headed to, and when they get there they blow up the nukes in each of the planes.
What would stop it?