They initiated their cockpit takeover within 30 minutes of takeoff.
( They ( ( ( initiated ( their ( cockpit takeover ) ) ) ( within ( ( 30 minutes ) ( of takeoff ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD initiated) (NP (PRP$ their) (NN cockpit) (NN takeover)) (PP (IN within) (NP (NP (CD 30) (NNS minutes)) (PP (IN of) (NP (NN takeoff)))))) (. .)))
The takeover began less than an hour after takeoff.
( ( The takeover ) ( ( ( began ( less ( ( than an ) hour ) ) ) ( after takeoff ) ) . ) )
(ROOT (S (NP (DT The) (NN takeover)) (VP (VBD began) (NP (QP (JJR less) (IN than) (DT an) (NN hour))) (PP (IN after) (NP (NN takeoff)))) (. .)))