At the moment none of the Crystalsky monitors will work with the Mavic Air, the Mavic Air requires DJI Go 4 version 4.2.4 to work and the CS only has version 4.1.18.
The DJI Go 4 can only be upgraded by a firmware update and DJI hasn't made this a priority for the Crystalsky, the CS is 4 versions of DJI Go 4 behind.