[fooey]

Or the reverse.

Since airports are one of the very few places where you can positively identify a certain person was there at a certain time, you can combine a passenger list with a device list to get some soft matches to previously unlinked devices.

Combine that linked metadata with other dragnet metadata, and you're going to learn a lot.

[harshreality]

That should mean they can also correlate who picks up or drops off whom... so even if you aren't traveling, you're in their database linked to someone who is.

[t34543]

Combined with APNR and patterns over time, yes.

[FPGAhacker]

This makes a lot of sense to me.