What's happening with ours?
 

Southwest Airlines is offering passengers the ability to send and receive iMessages from their iOS devices in-flight for $2 per day. In-flight Wi-Fi access for all applications is available for $8 per device per day.

It's likely that the airline is opening up iMessage related ports to users who pay the $2, while users who pay more receive access to in-flight email, social networks and the like. For a limited time, all users receive access to 13 live television channels on laptops and iOS devices for free.