Minutes later, United 175 turned southwest without clearance from air traffic control.
( ( Minutes later ) ( , ( ( United 175 ) ( ( ( ( turned southwest ) ( without clearance ) ) ( from ( air ( traffic control ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Minutes) (RB later)) (, ,) (NP (NNP United) (CD 175)) (VP (VBD turned) (NP (NN southwest)) (PP (IN without) (NP (NN clearance))) (PP (IN from) (NP (NN air) (NN traffic) (NN control)))) (. .)))
United 175 turned without clearance from air traffic control.  
( ( United 175 ) ( ( ( turned ( without clearance ) ) ( from ( air ( traffic control ) ) ) ) . ) )
(ROOT (S (NP (NNP United) (CD 175)) (VP (VBD turned) (PP (IN without) (NP (NN clearance))) (PP (IN from) (NP (NN air) (NN traffic) (NN control)))) (. .)))