Well you need a drivers liscence to operate a motor vehicle on "public " roads.
The ramp area is not a public road so it depends upon the rules of that particular airport. Operating a vehicle without a liscence may be a rule violation of the airport but not an illegal act.
In many states its illegal for anyone to operate vehicles that weigh over 18000 lbs without a CDL on public roads too, but not on the airport. Deicer trucks, Tractors, Aircraft (a motorized vehicle) and many other vehicles all weigh well over 18000lbs and rarely do the operators posess CDLs.
Shop talk and Free speech covers that.
Besides, Yahoo search "Dan Cunningham" Here is what you get " Results 1 - 10 of about 4,440,000 for Dan Cunningham - 0.22 sec."