The Vice President was mistaken in his belief that shootdown authorization had been passed to the pilots flying at NORAD's direction.
( ( The ( Vice President ) ) ( ( was ( ( mistaken ( in ( his belief ) ) ) ( that ( ( shootdown authorization ) ( had ( been ( passed ( to ( ( the pilots ) ( flying ( at ( ( NORAD 's ) direction ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Vice) (NNP President)) (VP (VBD was) (VP (VBN mistaken) (PP (IN in) (NP (PRP$ his) (NN belief))) (SBAR (IN that) (S (NP (NN shootdown) (NN authorization)) (VP (VBD had) (VP (VBN been) (VP (VBN passed) (PP (TO to) (NP (NP (DT the) (NNS pilots)) (VP (VBG flying) (PP (IN at) (NP (NP (NNP NORAD) (POS 's)) (NN direction))))))))))))) (. .)))
The Vice President thought that NORAD pilots had received the shootdown authorization.
( ( The ( Vice President ) ) ( ( thought ( that ( ( NORAD pilots ) ( had ( received ( the ( shootdown authorization ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Vice) (NNP President)) (VP (VBD thought) (SBAR (IN that) (S (NP (NNP NORAD) (NNS pilots)) (VP (VBD had) (VP (VBN received) (NP (DT the) (NN shootdown) (NN authorization))))))) (. .)))