"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Southwest Airlines Offering In-Flight iMessaging for $2 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.
Beginning today, Southwest is enabling iMessage for $2 a day!In-flight Wi-Fi is not yet available on all Southwest flights, but the airline has a Wi-Fi finder on its website so flyers can check if their aircraft will support the service.
Any Apple user that has iOS 5 or later with the iMessage feature pre-loaded on their device can take advantage of this option. Now you can stay powered up and connected to friends and family like you never left the ground.
Southwest Airlines flies within the United States, Mexico and the Caribbean.
Thanks to MacRumors Forum member Lumpydog for the screenshot!