The Command Center executed the request and, a minute later, Cleveland Center reported that United 93 may have a bomb on board.
( ( ( ( ( ( The ( Command Center ) ) ( executed ( the request ) ) ) and ) , ) ( ( ( a minute ) later ) ( , ( ( Cleveland Center ) ( reported ( that ( ( United 93 ) ( may ( have ( ( a bomb ) ( on board ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NNP Command) (NNP Center)) (VP (VBD executed) (NP (DT the) (NN request)))) (CC and) (, ,) (S (ADVP (NP (DT a) (NN minute)) (RB later)) (, ,) (NP (NNP Cleveland) (NNP Center)) (VP (VBD reported) (SBAR (IN that) (S (NP (NNP United) (CD 93)) (VP (MD may) (VP (VB have) (NP (NP (DT a) (NN bomb)) (PP (IN on) (NP (NN board)))))))))) (. .)))
The Command Center executed the request for the fighter pilots to search for a lost plane and a minute later the Cleveland Center reported that United 93 may have a bomb on board.
( ( ( ( ( The ( Command Center ) ) ( ( ( executed ( the request ) ) ( for ( the ( fighter pilots ) ) ) ) ( to ( search ( for ( a ( lost plane ) ) ) ) ) ) ) and ) ( ( ( a minute ) later ) ( ( the ( Cleveland Center ) ) ( reported ( that ( ( United 93 ) ( may ( have ( ( a bomb ) ( on board ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NNP Command) (NNP Center)) (VP (VBD executed) (NP (DT the) (NN request)) (PP (IN for) (NP (DT the) (NN fighter) (NNS pilots))) (S (VP (TO to) (VP (VB search) (PP (IN for) (NP (DT a) (VBN lost) (NN plane)))))))) (CC and) (S (ADVP (NP (DT a) (NN minute)) (RB later)) (NP (DT the) (NNP Cleveland) (NNP Center)) (VP (VBD reported) (SBAR (IN that) (S (NP (NNP United) (CD 93)) (VP (MD may) (VP (VB have) (NP (NP (DT a) (NN bomb)) (PP (IN on) (NP (NN board)))))))))) (. .)))