Not much context here with the single slide. How do you know its GSM? I would guess that they are accessing the inflight wifi, getting mac addresses, then xref

Not much context here with the single slide. How do you know its GSM? I would guess that they are accessing the inflight wifi, getting mac addresses, then xrefing that to known bad guy cellphones wifi mac addresses. I'm thinking there isn't some sniff-when-your-phone-is-on-airplane-mode sniffer stuck on tons of the world's transatlantic/over-water planes.