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Other registries that allowed for the use of reserved names have required special dispensation in the past. For instance, SITA uses two character airline designator codes in the second level domain of the structure of .aero. This caused some discussion, but it was widely felt that this was reasonable given that the IATA codes that SITA was proposing to use "...have been in use in the aviation community for about 50 years. They are a well established coding system within that community. The chances that these two-letter code elements can be mistaken for ISO 3166-1 Alpha-2 code elements are thus quite small."