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Welcome to Tech News Briefing. It's Monday, January 6th. I'm Julie Chang for the Wall Street Journal.

Electronic trackers have been used to find lost luggage for years. Now, Apple's latest OS updates

allow users to share air tag locations with some airlines. We'll tell you why that could help

them to find your lost bag. Plus, drones have changed how wars are fought in the sky.

Why defense companies and navies are betting that the new frontier for drone warfare is

underwater.

But first, we hope you've never experienced the misfortune of an airline losing your luggage.

But if you have, tracking devices like Apple Airtag's are a way to help ease some of that anxiety.

Powered by the vast and visible network of millions of Apple devices,

Airtag's have not only been used to locate lost luggage,

they've also helped pinpoint stolen campaign signs and even loved ones with dementia.

And air tags can now share a missing bag location with some airlines. Our personal tech columnist,

Nicole Nguyen, recently wrote about the best ways to use air tags to get your luggage back.

And she joins us now. Nicole, in your column, you mentioned that it matters where you put your air tag.

Explain that a bit for us. Yeah, so air tags run by Bluetooth rules. And that basically means

it is dictated by physics of wireless signals. Materials like glass, metal, can be obstructive to wireless signals. So if there's

something nearby that is interfering with the air tag's ability to communicate with other devices

...