Does 'At least some FAA officials in Boston Center and the New England Region knew that a hijacker on board American 11 had said we have some planes.' exist in a separate context from 'FAA officials in Boston Center were aware of a hijacker on American 11.', without logical interdependence?
At least some FAA officials in Boston Center and the New England Region knew that a hijacker on board American 11 had said we have some planes.###FAA officials in Boston Center were aware of a hijacker on American 11.