Air-traffic control radar appears to have measured a US Army helicopter flying at a lower altitude than an American Airlines ...
CNN on MSN6d
Latest radar evidence suggests Black Hawk in DC disaster was flying too high, but NTSB wants more proofNewly released data from ground-based radar came out Tuesday suggesting an Army helicopter was higher than it was supposed to ...
The National Transportation Safety Board says the helicopter must be recovered from the Potomac River so it can get more ...
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