TKDA is a 200-person engineering, architecture and planning firm headquartered in Saint Paul, Minn., with branch offices in Aurora, Ill., and Grand Rapids, Minn. Ranked among ENR s Top 500 Design Firms, TKDA provides multidiscipline planning and design services to aviation, rail, surface transportation, municipal and facilities market sectors. TKDA became 100-percent employee-owned in December 2000. The firm s work environment fosters a sense of ownership, as each employee owner has an opportunity to directly impact the company s success. TKDA serves the aviation industry with services that meet the changing needs of international commercial airlines, charter services and aviation enthusiasts. From runway design to regional airport planning services, TKDA's staff of airport professionals offers a full range of planning, design and construction engineering services