O aviso atual do Departamento de Estado dos EUA declara:
The U.S. Department of State warns U.S. citizens of increased threats from terrorist groups throughout Turkey and to avoid travel to southeastern Turkey. In light of the July 15 coup attempt and the resulting potential for interruptions to travel and daily life, we suggest U.S. citizens reconsider travel to Turkey at this time.
Isso implicaria que, se você puder evitar um trânsito de Istambul, você deve fazê-lo.