Home1997 Treaties and Agreements ...United Kingdom (12846) – Amendment to the Agreement of July 23, 1977, as Amended, Concerning Air Services hide United Kingdom (12846) – Amendment to the Agreement of July 23, 1977, as Amended, Concerning Air Services TIAS Office of Treaty Affairs April 7, 1997 Transportation: Air Services Agreement affected by exchange of notes; signed at Washington March 27, 1997; entered into force April 7, 1997. Download attachment [142 KB] Tags Transportation Treaties United Kingdom