Expedia reacted late to the shift, and its sales suffered this spring partly as a result. TripAdvisor, meanwhile, booked its fourth-straight quarter of better-than-expected earnings. The former subsidiary's success shows how swiftly currents can shift online, where travelers are increasingly planning their trips on sites that aggregate offerings from a number of different online sources. The shift is evident in the two companies' stock market value. At $6.9 billion, Expedia is now worth about 40% less than TripAdvisor, which is valued at more than $11 billion. It is also evident in data from Google - a company that competes with TripAdvisor for travel searches. Queries for "Tripadvisor" now surpass those for "Expedia" by nearly 50%. Less than two years ago, Expedia garnered twice as many searches as its then-subsidiary. Big online travel companies are hedging their bets against the trend to aggregation, which the industry insiders call "metasearch." Expedia itself paid about $620 million for a majority stake in Europe-focused aggregator Trivago in March. Two months later, Priceline bought online aggregator Kayak Software Corp. for $1.8 billion. Get the full story at The Wall Street Journal Read also "Expedia’s advertising challenge"