Skype blocked out of certain airspaces... FlyBe Airlines is running an Application to Control to block P2P file sharing and Skype in particular.

“Budget airline FlyBe is assessing anti-virus-style technology for locking down PCs which could reduce the costs associated with keeping blocked-application lists updated. Sophos' Application Control tool is designed to manage desktops and network bandwidth. Using anti-­virus signature technology to identify applications. ... it is able to stop users running instant messaging software such as MSN, voice over IP software such as Skype, P2P file-sharing applications and distributed computing projects such as Seti@Home. In addition, bandwidth consumption can be controlled by preventing legitimate applications from being run by certain end-users. FlyBe IT security manager Chris Cooper said, "We have been running a trial using Application Control to block P2P file sharing and Skype in particular." source.