Hotels are fighting back, but their adversaries have a unique advantage: They can plow huge amounts of their revenue back into ad spending because they don't have the burden of caring for properties. Online travel agencies are "basically marketing companies," said Douglas Quinby, senior VP-research at Phocuswright, a travel and hospitality research firm. "It's about data and technology, and they are just getting better and better at it." Expedia, whose brands include Trivago, Orbitz, and Hotwire, grew its overall U.S. ad spending by 16.6% last year to $1.6 billion, becoming the nation's 25th-largest advertiser, ahead of ad powers like Unilever, McDonald's and PepsiCo, according to Ad Age's 200 Leading National Advertisers 2017 report. Priceline Group also cracked the top 100. Now ranked 96, it boosted spending 10.3% to $461 million to promote brands that include Kayak and fast-rising, whose new "Nothing Is More Important" campaign touts hassle-free planning. Though the sector has brands aplenty, each also offers something slightly different. Trivago searches prices but doesn't provide booking, for example, while Hotwire sells unsold inventory at bargain prices. That allows for more experimentation with marketing tactics, noted Quinby. Get the full story at AdAge