Not exactly airlines, but an idea of where things are going.
We removed from our citation fleet our slow, old, heavy unreliable, cumbersome touch interfaced FAA certified NavAero EFB's (windowsXP / pentium II based) and replaced them with iPads with Jeppesen Flight Deck software, weight and balance, perf charts and one propietary app to manage certain company documentation. We have assigned one for each crew and one to each aircraft about year and a half ago, and we're not looking back to anything else. We even have our own internal procedures on how to use them, update them and how to notify if any hardware or software operational discrepancies arise (none so far), so we have had 100% reliability in that period of time.
Yes, we operate FAR Part 91, so we don't need to have FAA operational authorization to use them, but the company and general crew consensus is that if any time in the future, the regulator want us to be certified, we will gladly go that route and keep using iPAds for terminal and enroute charting.