37 Construction; airplane breakdown assistance [repair], airplane maintenance and repair, supervision [management] of aircraft construction work, disinfection, installation and repair of fire-detection devices, information relating to the construction of airplanes and aircraft, information relating to the repair of airplanes and aircraft, insulating of airplane bodies, washing of airplanes and aircraft, cleaning of airplanes and aircraft, polishing of vehicles, airplanes and aircraft, repair of pumps, sanding of airplanes and aircraft, retreading of tires, reconditioning of worn or partially destroyed motors and engines, rustproofing, vulcanization of tires [repair], reconditioning, restoration and repair of airplanes and aircraft, maintenance and modification of airplane and aircraft bodies, airplane and aircraft equipment servicing and compliance, fitting out of airplane and aircraft cabins, maintenance and servicing of landing gear and hydraulic equipment for aviation, maintenance of airplanes and aircraft online, modification [outfitting] of structures and systems on airplanes and aircraft; airplane maintenance services