[jacquesm]

And a firewall is not an airgap.

And a WiFi connection even though it goes 'through the air' is not an airgap.

The same for BT and any other kind of connectivity.

An airgap is only an airgap if you need physical access to a device to be able to import or export bits using a physical connection, and the location of the device is secured by physical barriers. Preferably a building that is secure against non-military wannabe intruders.