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Investigation Into Medical Helicopter Crash Could Take A Year, NTSB Says
Investigation Of Medical Helicopter Crash In Drexel Hill Could Take More Than A Year, NTSB Says
Investigation Into Medical Helicopter Crash May Take A Year, Federal Officials Say
NTSB Investigating After Medical Helicopter Crashes In Drexel Hill
NTSB Investigating Medical Helicopter Crash In Drexel Hill, Delaware County
2 killed in Texas helicopter crash and fire, officials say
NTSB probes wreckage of crashed medical helicopter
'Loud bang' heard before medical helicopter crash, NTSB preliminary report reveals
NTSB Investigation Into Deadly Helicopter Crash Underway
NTSB begins investigation into helicopter crash
NTSB releases preliminary report on Duke Life Flight crash that killed four
NTSB: Chopper Collision Part of Disturbing Trend
