Piper Jaffray analyst Michael Olson says his firm's survey of 1,000 U.S. consumers increases his confidence in his Overweight ratings on Priceline (PCLN) and Expedia (EXPE). The survey shows a "significant increase" in market share for Priceline brands, "stability" for Expedia brands and a decline in the number of people who either book direct on a hotel website or do not book travel online at all, Olson tells investors in a research note. He reiterates Overweight ratings on both Priceline and Expedia and maintains a Neutral rating on TripAdvisor (TRIP).