I have called the General Aviation Facility at DFW and they informed me that there is a $25 charge for parking on the ramp at minimum..based on length of time. I work at a hangar at DFW(A&P Mechanic) and wondering if i would be able to fly in(C-172) and park the aircraft at my companies hangar without being charged any type of landing/parking fees? Would ATC automatically direct me to GA Ramp for payment/landing fee?