In-flight Wi-Fi continues to be a crapshoot on U.S. airlines, even as many passengers express ambivalence about the service. While Delta Air Lines now has Wi-Fi on nearly all the 549 planes in its fleet, Continental Airlines has "zero" service as it awaits its merger with United. Even so, in-flight Internet appears to be growing increasingly common despite generating only about $95 million in revenues for the airlines this year. Research firm In-Stat estimates that 2,000 commercial aircraft will be equipped for Wi-Fi by the end of this year, compared with just 25 planes in 2008.
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