The sample for the test must have been taken within 72 hours prior to the passenger's scheduled departure from the country of origin.
https://www.turkishairlines.com/en-t...ons/index.html
I see the TIMATIC first embarkation point.
But the Turkish airlines wording seems like on the flight that leaves COUNTRY OF ORIGIN.
Have SEA-ORD-IST.
SEA-ORD flight is late AM. ORD-IST is 2135pm. Does this mean 72 hours from SEA-ORD or ORD-IST?