I may have been a little rough on you Europeans with your towbarless tugs and all. In my neck of the woods, most airline tows are done that way, with radios in the tugs. The ground handlers such as Swissport here don't have fancy stuff like this, and certainly don't have radios. I suspect much the same down south. Ad-hoc charters tend to use whoever is available on the airfield, and the results can be interesting.