We're told that one aircraft is down but we do not have a pilot report that did it.
( ( ( ( We ( 're ( told ( that ( ( one aircraft ) ( is down ) ) ) ) ) ) but ) ( we ( ( do not ) ( have ( ( a ( pilot report ) ) ( that ( did it ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP We)) (VP (VBP 're) (VP (VBN told) (SBAR (IN that) (S (NP (CD one) (NN aircraft)) (VP (VBZ is) (ADJP (RP down)))))))) (CC but) (S (NP (PRP we)) (VP (VBP do) (RB not) (VP (VB have) (NP (NP (DT a) (NN pilot) (NN report)) (SBAR (WHNP (WDT that)) (S (VP (VBD did) (NP (PRP it))))))))) (. .)))
We're told that all of the aircraft are down and which pilots took action.
( We ( ( 're ( told ( ( ( that ( ( all ( of ( the aircraft ) ) ) ( are down ) ) ) and ) ( which ( pilots ( took action ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP 're) (VP (VBN told) (SBAR (SBAR (IN that) (S (NP (NP (DT all)) (PP (IN of) (NP (DT the) (NN aircraft)))) (VP (VBP are) (ADJP (RP down))))) (CC and) (SBAR (WHNP (WDT which)) (S (NP (NNS pilots)) (VP (VBD took) (NP (NN action)))))))) (. .)))