You're on a nice, long domestic flight. In coach. There's a screaming baby two rows up; the pages of the in-flight magazine are stuck together with someone else's chewing gum; and the 9-inch overhead CRT is showing a 2-year-old episode of New Girl that you've already seen a half-dozen times -- without sound, because you always end up in the seat with a broken headphone jack. Oh, and you have five hours left to go to LAX.
If you play your cards right (and pack some noise-canceling headphones), your next cross-country haul could be a whole lot more pleasant, thanks to in-flight WiFi. Nearly all of the major US airlines now offer WiFi in the sky. Thousands of passengers flying above North America are online right now, watching adorable kittens meow on YouTube, reading up on their destinations or researching a new device right here on Engadget. But while some carriers offer service on many of their planes, few have it available fleet-wide, making it difficult to plan your travel around connectivity. So, which airlines offer the best service and how can you sort what you'll have on board? Explore the turbulent world of WiFi at 30,000 feet.