The Air has Spotify Connect integrated to into it as a streaming service.
However, the Air also plays music from any Bluetooth or AirPlay device. This means it can play back any Streaming Service that is sent to it by the source (Bluetooth or Airplay) device. For example, if your phone or laptop has Tidal, Deezer or Qobuz running on it, then this audio can be sent and played back through the Air.
Details on how to use Spotify Connect can be found here.