It’s just using Bing Maps data, which is smart. Not everyone flies at 35,000 feet, low altitude flights look spectacular and are accurate in a way no stored world map could. The terrain is automatically generated from Bing data, not hand modeled. Every building is in the right spot, is the right height, and the exact right shape, and it costs me no storage. It’s an obvious evolution of the genre with all kinds of benefits. Like all airports on earth, even grass landing straps, that are visible in Bing Maps, exist in the game without having to be hand modeled or stored locally. It detects them then automatically then plops down an in game runway, tarmac, and taxiways on top of the satellite imagery in the exact shape and size as the real thing. It’s really cool!