Both pilots had been killed (reported by one flight attendant).
( ( Both pilots ) ( ( had ( been ( killed ( -LRB- ( ( reported ( by ( one ( flight attendant ) ) ) ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (DT Both) (NNS pilots)) (VP (VBD had) (VP (VBN been) (VP (VBN killed) (PRN (-LRB- -LRB-) (VP (VBN reported) (PP (IN by) (NP (CD one) (NN flight) (NN attendant)))) (-RRB- -RRB-))))) (. .)))
Both of the pilots were still alive. 
( ( Both ( of ( the pilots ) ) ) ( ( ( were still ) alive ) . ) )
(ROOT (S (NP (NP (DT Both)) (PP (IN of) (NP (DT the) (NNS pilots)))) (VP (VBD were) (ADVP (RB still)) (ADJP (JJ alive))) (. .)))