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 believe some planes have been taken down.
( I ( ( believe ( ( some planes ) ( have ( been ( taken down ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP believe) (SBAR (S (NP (DT some) (NNS planes)) (VP (VBP have) (VP (VBN been) (VP (VBN taken) (PRT (RP down)))))))) (. .)))