[Smokin' Joe]

You can't have everyone talking at once on the same channel.

Even po-dunk VFDs have more than one 'channel'. NYC should have a wad of them, and emergency communications coordination.

It didn't because the emergency center was in a building in the same complex as the targeted towers.

Still, I would expect one or more mobile commo vans (command centers) which could have handled a localized crisis in a city that size.

It really should have been evident that it was only a question of 'when', not 'if' there would be a problem with that many people in such a small area in a city which is, by virtue of its size (if nothing else), a high profile target.

And although it is not possible for anyone to anticipate every possibility, the WTC had already been the target of one bombing.

[P-40]

NYC should have a wad of them, and emergency communications coordination.

They did have many channels set up for different purposes but they generally stayed flooded, did not work beyond certain floors due to various failures, didn't work well between departments due to a lack of protocol, etc. If you want a fairly concise summary I can locate one for you.