An AirTag doesn’t transmit its location directly to the internet. Instead, it broadcasts a low-power Bluetooth signal that any nearby iPhone (with the feature enabled) detects and relays anonymously through Apple’s Find My network — the tag’s reported location is really a report from whichever nearby device last picked up its signal.
This makes it genuinely effective in busy environments with lots of iPhones nearby — an airport terminal or a baggage handling area with staff carrying phones — but less reliable in a remote holding area, a cargo container with no nearby devices, or regions where iPhone density is lower.
For luggage specifically, mounting the tracker deep inside the case lining rather than an easily accessible pocket protects it from being removed, and checking its last reported location and timestamp (rather than assuming it updates live) gives the most accurate picture of where a bag has actually been.
Check with your airline and read the label before you follow anything here. Lithium battery watt-hour limits, liquids allowances and lock policies differ by carrier and by country, and change over time — the figures published by the airline or security authority you are actually traveling with take precedence over anything written on this site. A power bank or spare battery is carried exactly as its manufacturer and your airline specify, never estimated. We report what is published — a watt-hour rating, a size limit, a lock's official recognition — and this site describes the equipment only: nothing here is a guarantee about what a specific checkpoint will allow on a specific day.
Last reviewed 26 August 2026