37 Inspection, maintenance, refurbishment and repair of aircraft and parts and fittings thereof; exchanging aircraft parts; assembly, disassembly and repair of aircraft and parts and fittings thereof; conversion of aircraft and parts and fittings thereof; modernisation of aircraft and parts and fittings thereof; improvement and conversion of aircraft and parts and fittings thereof; painting of aircraft; inspection and overhaul programs for aircraft and parts and fittings thereof; providing information on repair services in the aviation sector; technical monitoring of aircraft and parts and fittings thereof; consultancy and advisory services relating to the aforesaid services; consultancy services and management services relating to the repair and maintenance of aircraft and parts and fittings thereof; aircraft fuelling services; aircraft runway services, namely, aircraft fuelling services, and cleaning of aircraft; advisory and consultancy services relating to the aforesaid services