答案

(S1) accomplished
(S2) headquarters
(S3) interviewing
(S4) scenes
(S5) participants
(S6) access
(S7) verified
(S8) Reporters and editors also scrutinized hundreds of pages of records, including transcripts of radio calls with the four hijacked jets and a long kept by the Federal Aviation Administration.
(S9) USA TODAY compiled and analyzed data from several sources.
(S10) commercial jets, private planes, cargo jetsand military aircraft.