The definition of an airgap is "limit the connection" by transferring data through the air.
There are QR codes on both sides.
QR code input
QR code output
Airgapped on both sides.

I've already performed this operation by hand when changing my recovery account signed by owner key.
Which was a complete pain in the ass but it worked.
I can also be done using a flash drive; still technically airgapped but not as secure as a raw QR code.