“Southwest said it would begin trials this summer with high-speed Internet service on four of its 737s. Alaska has said it would launch a trial in the same rough timeframe on one plane. Also this summer, American will launch onboard Internet service on its entire fleet of coast-to-coast 767s, and Virgin America plans on rolling out the service on all of its planes. “
So it looks like Southwest and Alaska are airlines to stay away from if WiFi is important to you, at least for the near-future.