And it's my understanding they've already taken a couple of aircraft out.
( And ( it ( ( 's ( ( my understanding ) ( they ( ( 've already ) ( ( taken ( ( a couple ) ( of aircraft ) ) ) out ) ) ) ) ) . ) ) )
(ROOT (S (CC And) (NP (PRP it)) (VP (VBZ 's) (NP (NP (PRP$ my) (NN understanding)) (SBAR (S (NP (PRP they)) (VP (VBP 've) (ADVP (RB already)) (VP (VBN taken) (NP (NP (DT a) (NN couple)) (PP (IN of) (NP (NN aircraft)))) (ADVP (RB out)))))))) (. .)))
I don't know anything about what happened to the planes.
( I ( ( ( do n't ) ( ( know anything ) ( about ( what ( happened ( to ( the planes ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP do) (RB n't) (VP (VB know) (NP (NN anything)) (PP (IN about) (SBAR (WHNP (WP what)) (S (VP (VBD happened) (PP (TO to) (NP (DT the) (NNS planes))))))))) (. .)))