Citi analyst Jeremy David upgraded GoPro to Buy from Neutral and raised his price target for GoPro to $90 from $63. The company will be a long-term beneficiary of "mega-trends" in flying cameras and virtual reality, David tells investors in a research note. The analyst views the consumer drone/quadcopter opportunity as attractive and estimates the flying camera market to be 10M units and $5B-$10B in sales in 2020. He believes GoPro could become a top-two player in this market. David raised his 2016 and 2017 estimates for the action camera maker. The stock closed yesterday down 18c to $61.69.