Home2021 Treaties and Agreements ...United Kingdom (21-929) – Extension of Agreement Concerning the Use of Facilities by Civil Aircraft hide United Kingdom (21-929) – Extension of Agreement Concerning the Use of Facilities by Civil Aircraft TIAS Office of Treaty Affairs September 29, 2021 Defense Effected by exchange of notes at Washington September 28 and 29, 2021; entered into force September 29, 2021. Extension of agreement of June 6, 2016: TIAS 16-606.1. Download Agreement [593 KB] Tags Defense Treaties United Kingdom