During the Passenger-to-Freighter (P2F) conversion of Airbus A320 and A321 aircraft, certain passenger doors are replaced with door plugs to maintain the aircraft's structural integrity and to comply with freighter specifications. These door plugs are designed to fit seamlessly into the existing door frames, effectively sealing the openings and ensuring the fuselage's strength is preserved. The materials used are typically high-strength aerospace-grade alloys, such as aluminum or composites, chosen for their durability and compatibility with the aircraft's structure. The installation of door plugs is a critical step in the conversion process, enabling the aircraft to meet the specific requirements for cargo operations. ASTK's expertise in manufacturing these components underscores their role in supporting the P2F conversion process, contributing to the growing fleet of freighter aircraft in the industry.