Slip n' Sky

Slip n' Sky
The Slip n' Sky is a landside building that is the last one to unlock, as it is unlocked at Level 60. It's quite cheap with its price, just 19 AirCash. It gives you 2000 passengers every 2 hours. Sadly like the Skyrama Center for Air and Space Travel, it's rarely seen as other landside buildings are better than this.