[t0mas88]

For aviation regulations there is no different between an active or passive tracker, the rules are not about takers.

The rules are about there being a lithium battery in it (there is) and whether it has a radio transmitter (it does, airtags transmit Bluetooth signals).

Lithium batteries are not allowed in checked baggage. Transmitters are allowed only if turned off.

[dghlsakjg]

Lithium button batteries of the size you would find in a tracker are allowed in checked baggage.

You are correct about transmitters though