But for 8 minutes and 13 seconds, between 8:56 and 9:05, this primary radar information on American 77 was not displayed to controllers at Indianapolis Center.
( But ( ( for ( ( ( 8 minutes ) and ) ( ( ( 13 seconds ) , ) ( ( ( between 8:56 ) and ) 9:05 ) ) ) ) ( , ( ( ( this ( primary ( radar information ) ) ) ( on ( American 77 ) ) ) ( ( ( was not ) ( displayed ( to ( controllers ( at ( Indianapolis Center ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (CC But) (PP (IN for) (NP (NP (CD 8) (NNS minutes)) (CC and) (NP (NP (CD 13) (NNS seconds)) (, ,) (NP (QP (IN between) (CD 8:56) (CC and) (CD 9:05)))))) (, ,) (NP (NP (DT this) (JJ primary) (NN radar) (NN information)) (PP (IN on) (NP (NNP American) (CD 77)))) (VP (VBD was) (RB not) (VP (VBN displayed) (PP (TO to) (NP (NP (NNS controllers)) (PP (IN at) (NP (NNP Indianapolis) (NNP Center))))))) (. .)))
American 77 had its transponder altered so there was no data on the primary radar.  
( ( American 77 ) ( ( had ( ( its transponder ) ( altered ( so ( there ( was ( ( no data ) ( on ( the ( primary radar ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP American) (CD 77)) (VP (VBD had) (NP (NP (PRP$ its) (NN transponder)) (VP (VBN altered) (SBAR (IN so) (S (NP (EX there)) (VP (VBD was) (NP (NP (DT no) (NNS data)) (PP (IN on) (NP (DT the) (JJ primary) (NN radar)))))))))) (. .)))