FAA allows luggage tracking devices
 

"...the FAA has cleared passengers to monitor their checked luggage’s location themselves. According to PocketLint the agency has ruled that operating Apple AirTags can be fastened to bags stowed in the holds of airliners. There had been concerns the tiny lithium batteries inside the transmitters might pose a fire hazard but the agency says the 0.01 gram of lithium in the little trackers’ batteries aren’t a flight hazard. It has actually set the limit at 0.03 grams for tags fastened to luggage."


Read more:

https://www.avweb.com/aviation-news/...-gets-faa-nod/

Even with the small concern, I can’t see it being an issue. They use non-rechargeable lithium batteries as opposed to lithium ion batteries found in phones and such. It blows my mind that some airlines want to ban them.

Tiny lithium batteries might be the excuse for that, but I bet it's not the reason...