I just logged onto both the UA and TK sites and now I can't even price my itinerary of MCI to ATH, connecting to TK in ORD and IST. I'm aware that you don't have to have a visa to transit in IST. However, this has to be related to the current situation between Turkey / USA effective October 9th. Hopefully, there's a quick resolution ... the visa ban will be lifted in both directions ... and it will be business as normal.