The Federal Aviation Administration (FAA) is seeking qualified architectural and engineering (A-E) firms for an Indefinite Delivery/Indefinite Quantity (IDIQ) contract focused on site adaptations for the Low Activity Standard Design of Airport Traffic Control Towers (ATCTs). The selected firms will provide a range of professional services, including design reviews, facilities engineering support, and risk management, to assist in replacing aging ATCTs across the United States as part of the National Airspace System (NAS) infrastructure improvements. This procurement is crucial for ensuring the safety and efficiency of air traffic control operations, with a specific emphasis on firms that meet the small business criteria under NAICS code 541310. Interested firms must submit their capability statements and other required documentation electronically to Mary Higgins at mary.higgins@faa.gov by March 27, 2025, at 4:00 PM CT, to be considered for this opportunity.