lhrsfosyd91 wrote:What is the busiest European airport by International passenger numbers not served by US3?
That would definitely be the new IST airport. And as it's to the west of the Bosporus, it technically is in Europe. As it just opened there's no full year traffic figures as of yet, but the old Istanbul Atatürk airport had about 68 million pax last year.
Both DL and UA did however fly there not too long ago, from JFK and EWR respectively. DL dropped it in 2016 due to 'increased security concerns in Turkey, including a travel warning issued by the State Department, and weaker demand for air travel to this market'. UA dropped it in 2013 after they 'carefully considered the viability of the Istanbul-New York route and concluded that there is not sufficient demand in the market to sustain non-stop service', preferring instead to rely on Star Alliance partners such as LH and TK.