Three of the flights had actually taken off within 10 to 15 minutes of their planned departure times.
( ( Three ( of ( the flights ) ) ) ( ( ( had actually ) ( ( taken off ) ( within ( ( ( ( 10 to ) 15 ) minutes ) ( of ( their ( planned ( departure times ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD Three)) (PP (IN of) (NP (DT the) (NNS flights)))) (VP (VBD had) (ADVP (RB actually)) (VP (VBN taken) (PRT (RP off)) (PP (IN within) (NP (NP (QP (CD 10) (TO to) (CD 15)) (NNS minutes)) (PP (IN of) (NP (PRP$ their) (JJ planned) (NN departure) (NNS times))))))) (. .)))
There of the flights had taken off, but the others remained.
( ( ( ( ( ( There ( of ( the flights ) ) ) ( had ( taken off ) ) ) , ) but ) ( ( the others ) remained ) ) . )
(ROOT (S (S (NP (NP (EX There)) (PP (IN of) (NP (DT the) (NNS flights)))) (VP (VBD had) (VP (VBN taken) (PRT (RP off))))) (, ,) (CC but) (S (NP (DT the) (NNS others)) (VP (VBD remained))) (. .)))