Contact Us John Luke III, Airport Manager Montgomery County Airpark 7940 Airpark Drive Gaithersburg, MD 20879 Phone: 301-963-7100 Fax: 301-869-6510 Toll Free: 877 I FLY GAI Montgomery County Revenue Authority Executive Office Building 101 Monroe Street, Suite 410 Rockville, MD 20850 Phone: 301-762-9080 Fax: 301-309-0652 Driving Directions Click here to map your route to and from the Montgomery County Airpark (GAI) First Name **Required Last Name **Required Street Address City State or Provence Postal Code Country Telephone Number **Required E-Mail Address **Required Comments