Here in Europe, other than Norwegian Air, Wi-Fi on flights is a missing link to my travel. It seems according to the recent Skift report, others feel in-flight connectivity is important too.
Let's face it, I love to fly on Wi-Fi equipped planes in the USA because it keeps me "connected" and when I get off the plane my inbox isn't jammed, and I know more of what is going on around me where I land. That's why, when Virgin America first launched their service with Wi-Fi on every plane I pretty much stopped flying Southwest where I was an 30+ flight a year "A" lister. As other US based airlines added Wi-Fi their flights with Wi-Fi became my chosen carriers, which meant Delta right behind Virgin America.