Online travel agencies remain a big hit with shoppers, new survey data show, but the sites’ popularity could fade if contract battles with airlines leave them with fewer airfares to lure bargain-chasing consumers, researchers warned.

With airfares soaring and the economy stuck in the doldrums, consumers continue to flock to travel sites to plot dream vacations and research deals and steals, a market that’s expected to total $104.6 billion in 2011, according to market research firm PhoCusWright Inc. Get the full story »