         Sentence 1: But. for 8:minutes and 13  seconds, between’ 8:56: and 9:05, ‘this  primary: radar * information, .-’ on  Ameérican’’ 77. was hot” displayed to  controllérs-at‘ Indianapolis Center. |    Sentence. 2:.Amierican..77..had its  transponder altered so: there -was: nd,  data on the primary radar.