That uses a different method. Your Jeep has a GPS in it, and the GPS in your Jeep finds its location with help from the GPS array. Your Jeep reports the location it "finds itself" at, typically via cell service, but could be by satellite, to whoever has the key/right to knowing the location of your Jeep.
Planes have GPS too, but I suspect that was turned off.
-- an engineer who can write for God's sakes... --
Heheheh. A frightening thought! Speaking as an engineer.
The GPS data would have been part of the subscription service that the airline did subscribe to. The subscription service costs about $1000/month/airplane.
Whoops. Typo. The airline did NOT subscribe to the Boeing AHM data subscription service that would have provided GPS data via the Iridium link.