Shootdown authority was first communicated to NEADS at 10:31.
( ( Shootdown authority ) ( ( ( was first ) ( communicated ( to ( NEADS ( at 10:31 ) ) ) ) ) . ) )
(ROOT (S (NP (NN Shootdown) (NN authority)) (VP (VBD was) (ADVP (RB first)) (VP (VBN communicated) (PP (TO to) (NP (NP (NNS NEADS)) (PP (IN at) (NP (CD 10:31))))))) (. .)))
NEADS shot down a plane at 10:43.
( NEADS ( ( ( shot down ) ( ( a plane ) ( at 10:43 ) ) ) . ) )
(ROOT (S (NP (NNS NEADS)) (VP (VBD shot) (PRT (RP down)) (NP (NP (DT a) (NN plane)) (PP (IN at) (NP (CD 10:43))))) (. .)))