Public Transportation from Phoenix-Mesa Gateway Airport to your destination:  Aside from using a taxi, sedan, limo or shuttle service, Valley Metro public bus serves Park N Ride:

The Valley Metro provides routes for Greater Phoenix Metro Area:
Route 184 runs between the Airport and Power Road Park N Ride (with stops in between). For  more information visit http://routes.valleymetro.org/timetables//2/route_list - then click on Route 184 - Power Rd., view southbound tab

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