Cesium Ion offline

Hi there,
I have developed a real time 3D aircraft tracking map using cesium. By referring Build a Flight Tracker – Cesium this example. I’m using the terrain provider as terrainProvider: Cesium.createWorldTerrain(),
It is working fine in my local machine and in the server too. My question is that can I use this completely offline. Because I’m not accessible to the internet. Developing a map to use inside the aircraft. Is Cesium Ion is installable in such portable devices?

@Gabby_Getz @hannah @Erixen_Cruz