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 intitiated the takeover ten minutes behind schedule 
( ( The intitiated ) ( ( ( the takeover ) ( ten minutes ) ) ( behind schedule ) ) )
(ROOT (NP (NP (DT The) (NN intitiated)) (NP (NP (DT the) (NN takeover)) (NP (CD ten) (NNS minutes)) (PP (IN behind) (NP (NN schedule))))))