FlyerTalk Evangelist
Join Date: Nov 2018
Location: Istanbul, Turkey
Programs: TK Elite Plus,BAEC GGL,ITA Executive, AFKL Gold,QR Gold,HH Diamond,Bonvoy Gold,ALL Gold
Posts: 14,186
TK added an extra IST-IAD-IST service on 11 July ( Saturday ).
The reason is unknown at the moment but probably it's added to accommodate those passengers originally booked on LAX and MIA flights.