SAN FRANCISCO (KGO) -- It's not a bird, it's not a plane, but if you look up while in San Francisco's financial district Sunday night, you just might see two low-flying helicopters. The aircraft will ...
Helicopters have one of the most recognizable sounds in aviation. The signature "whop whop" or deep thumping sound announces its arrival long before it appears in the sky. It's a sound so iconic, it's ...
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