關於「Ivao xn」標籤，搜尋引擎有相關的訊息討論：

XN Division - IVAO - International Virtual Aviation Organisationwww.ivao.aero › divisions › division › Id=XNIVAO - International Virtual Aviation Organizationwt.ivao.aero0001193125-20-041927.txt - SEC.govwww.sec.gov › Archives › edgar › dataFIDIC Contracts Guide | PDF - Scribdf