Circular No. 32/2021/TT-BGTVT dated December 14, 2021 amendments to Circular No. 19/2017/TT-BGTVT prescribing management and provision of air navigation services
Circular No. 32/2021/TT-BGTVT dated December 14, 2021 amendments to Circular No. 19/2017/TT-BGTVT prescribing management and provision of air navigation services