Close calls between aircrafts and helicopters happened near-daily at DCA, CBS News analysis finds
A CBS News data analysis revealed that for a year leading up to January's deadly mid-air crash over the Potomac River, there were close encounters between helicopters and aircrafts nearly every day. CBS News' Kris Van Cleave reports on the findings.
A CBS News data analysis revealed that for a year leading up to January's deadly mid-air crash over the Potomac River, there were close encounters between helicopters and aircrafts nearly every day. CBS News' Kris Van Cleave reports on the findings.
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