A couple new lights and sounds push vehicles (with figure) have been released to help keep things running smoothly at the new GeoTrax airport.
Chugger and Chandler help keep the airplanes fueled up. Wheeler and Wes help direct traffic on the ground and move luggage around.
Get the instruction sheets for these two sets.
I haven't been able to locate these in stores yet so if they are an immediate "must have" for your set I would recommend ordering direct from Fisher Price...see the links above.