This MCC includes businesses related to the aviation industry, such as airports and aviation services. Aviation MCCs have caused controversies due to overlap between airfare and non-airline services that happen to take place in airports, such as food courts, retail, and car rentals. These issues should be resolved by classifying airport services under their designated MCCs rather than as airport-related, e.g. 5812 for food court restaurants. This MCC is reserved for truly aviation-related services such as aircraft cleaning, aircraft repair, aircraft storage at airports, and airport hangar rental.