NORAD would receive tracking information for the hijacked aircraft either from joint use radar or from the relevant FAA air traffic control facility.
( NORAD ( ( would ( ( receive ( ( tracking information ) ( for ( the ( hijacked aircraft ) ) ) ) ) ( either ( ( ( from ( joint ( use radar ) ) ) or ) ( from ( the ( relevant ( FAA ( air ( traffic ( control facility ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP NORAD)) (VP (MD would) (VP (VB receive) (NP (NP (NN tracking) (NN information)) (PP (IN for) (NP (DT the) (JJ hijacked) (NN aircraft)))) (PP (CC either) (PP (IN from) (NP (JJ joint) (NN use) (NN radar))) (CC or) (PP (IN from) (NP (DT the) (JJ relevant) (NNP FAA) (NN air) (NN traffic) (NN control) (NN facility)))))) (. .)))
NORAD gets tracking information for planes from joint use radar or the FAA but now we know there are gaps in the information.
( ( ( ( ( NORAD ( gets ( ( tracking information ) ( for ( planes ( from ( ( ( joint ( use radar ) ) or ) ( the FAA ) ) ) ) ) ) ) ) but ) now ) ( we ( know ( there ( are ( gaps ( in ( the information ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP NORAD)) (VP (VBZ gets) (S (VP (VBG tracking) (NP (NN information)) (PP (IN for) (NP (NP (NNS planes)) (PP (IN from) (NP (NP (JJ joint) (NN use) (NN radar)) (CC or) (NP (DT the) (NNP FAA)))))))))) (CC but) (ADVP (RB now)) (S (NP (PRP we)) (VP (VBP know) (SBAR (S (NP (EX there)) (VP (VBP are) (NP (NP (NNS gaps)) (PP (IN in) (NP (DT the) (NN information))))))))) (. .)))