This Sub-class includes the operation and management of airports. Units in this Sub-class are primarily engaged in one or more of the following: •landing, parking and/or aerobridge fees and/or passenger service charges •runway maintenance services •fire-fighting and/or fire-prevention services at airports •provision of other airport and airport-related facilities and/or services
•wholesaling fuel at airports, see 46610 •representative offices of foreign airlines, see 52231 •airline agencies (freight), see 52232 •airport terminal services (e.g. ground service activities), see 52234 •airline food catering services, see 56200 •cleaning of airports, see 81211 •operation of flying schools, see 85406