40 Treatment and processing of materials, namely, laser beam treatment of wings, fins, wingtips, control valves, tail fins, tarpaulins, tail units, wheels for landing gear, landing gear, fuselage, namely, empennage, control surfaces, namely, vertical stabilizers and rudders, horizontal stabilizers and elevators, ailerons, trim tabs, lift control devices, namely, flaps, slats, spoilers, power plant and propulsion devices, namely, propellers, piston engines, jet engines, turboprops, landing gear, namely, nose gears, main gears, passenger floor structure, cargo floor structures, brackets for system installation, brackets for hydraulic system installation, seat rails, passenger door structures, cargo door structures, main landing gear door structures, nose landing gear structures, windows frames structures, front windshield at cockpit structures, lateral windshield at cockpit structures, engine pylon structures; custom or contract manufacturing of aircraft for others; custom or contract manufacturing of aircraft components for others; the aforesaid services being intended for the maintenance and repair of aircraft and aircraft structures * ; all the aforesaid services related to the technical field of aircraft *