Thse are traincar models (drivable), the first is used to push back larger aircraft from the terminal. As the wheelbase of these aircraft is large, and track curves may be tight, the pushback bar may not always align with the front landing gear of the aircraft, but nevertheless it is realistic.

The model has animated wheels, and can be driven to the aircraft to push back from the terminals. The vehicle users running numbers to individually number them. The tractor is model 4 below.

There is a smaller tractor for use on aircraft carriers, model 6 below.

Aircraft Pushback Tractor 4 kuid2:60238:9564:2
Aircraft Carrier Pushback Tractor 6  kuid2:60238:9619:2