The Wall Street Journal reports on web sites that link single travelers. AirTroductions has more than 18,000 members posting itineraries from Nigeria to France. Tripmates promises to help match members with people living or traveling to specific destinations. Informally, singles have been arranging similar meetings on their own for years through sites like Craigslist and FlyerTalk.com. But the newer travel matchmaking sites build on this informal practice, often using social-networking technology. Sites say they're tapping into a lucrative segment of the travel market. According to a recent survey of 8,449 single people in the U.S. by Mintel International Group, a market-research firm, 61% had traveled domestically in the last year, spending an average of $438 on a domestic airline ticket.
