▁its ▁final ▁Atlanta - Sh ang hai ▁route ▁on ▁September ▁ 1 , ▁ 2 0 0 9 . ▁D elta ▁replaced ▁North west ▁on ▁its ▁Detroit – Sh ang hai ▁service ▁using ▁its ▁Bo eing ▁ 7 7 7 ▁on ▁October ▁ 2 4 , ▁ 2 0 0 9 . ▁D elta ▁re - inst ated ▁the ▁Atlanta ▁to ▁Shang hai ▁route ▁on ▁June ▁ 5 , ▁ 2 0 1 1 , ▁operating ▁ 2 ▁days ▁a ▁week , ▁as ▁part ▁of ▁the ▁car rier ' s ▁international ▁expansion ▁for ▁ 2 0 1 1 . ▁The ▁route , ▁however , ▁ceased ▁on ▁January ▁ 1 7 , ▁ 2 0 1 2 ▁for ▁the ▁second ▁time ▁cit ing ▁poor ▁performance ▁on ▁the ▁route . ▁▁ 1 9 9 9 ▁to ▁ 2 0 0 7 ▁▁ 1 9 9 9 ▁Air ▁Services ▁Ag re ement ▁Con cluded ▁in ▁April ▁ 1 9 9 9 , ▁air lines ▁from ▁each ▁country ▁were ▁allowed ▁to ▁increase ▁the ▁number ▁of ▁week ly ▁fl ights ▁from ▁ 2 7 ▁to ▁ 5 4 , ▁including ▁cargo ▁fl ights . ▁ 2 0 ▁of ▁these ▁fl ights ▁were ▁designated ▁for ▁all - c argo ▁fl ights . ▁Each ▁country ▁was ▁allowed ▁to ▁design ate ▁one ▁additional ▁air line ▁so ▁that ▁four ▁air lines ▁from ▁each ▁country ▁were ▁allowed ▁to ▁fly ▁between ▁the ▁two ▁countries . ▁ ▁United ▁Airlines ▁gained ▁additional ▁frequencies ▁under ▁this ▁agreement ▁and , ▁in ▁April ▁ 2 0 0 0 ,