At 9:24, Ballinger's warning to United 93 was received in the cockpit.
( ( At 9:24 ) ( , ( ( ( ( Ballinger 's ) warning ) ( to ( United 93 ) ) ) ( ( was ( received ( in ( the cockpit ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:24))) (, ,) (NP (NP (NP (NNP Ballinger) (POS 's)) (NN warning)) (PP (TO to) (NP (NNP United) (CD 93)))) (VP (VBD was) (VP (VBN received) (PP (IN in) (NP (DT the) (NN cockpit))))) (. .)))
Ballinger's warning was recieved without problem at 9:24
( ( ( Ballinger 's ) warning ) ( was ( ( recieved ( without problem ) ) ( at 9:24 ) ) ) )
(ROOT (S (NP (NP (NNP Ballinger) (POS 's)) (NN warning)) (VP (VBD was) (VP (VBN recieved) (PP (IN without) (NP (NN problem))) (PP (IN at) (NP (CD 9:24)))))))