PARK CITY, Ut. | (Film critic Eric Althoff is in Park City covering Sundance 2020 for Screen Comment) Matt Yoka found a rather unusual Los Angeles treasure trove in an unassuming storage unit. There, in multiple boxes, sat some 3,200 ¾ inch Betamax tapes of helicopter news footage, all of it captured in the nineties by a now-defunct aerial news firm called Los Angeles News Service.