How long can you hold the line? Air Lane is back but this time it's on the battle field. After directing hundreds of aircraft to the runway, it's time that you take your skills to the next level. Welcome to Battle Lines. It's air traffic control in the middle of a battle field. You're not the innocent traffic controller anymore. You're part of the battle and how long your airport survives will depend on how quickly you can get friend and foe to the ground.