Sabiha Gökçen Airport sits on the Asian shore of Istanbul, in the district of Pendik — a long way in spirit from the mountain towns and valleys where the Turkish military and PKK militants had been fighting since the breakdown of ceasefire negotiations in July 2015. Yet the reach of that conflict proved longer than any airport perimeter fence. The shells were fired from a forested area roughly two kilometers from the runway, sometime in those quiet hours when aircraft are parked and passenger traffic has stilled. Eyewitnesses heard what they initially described as three successive blasts. Official tallies would later establish four mortar impacts. Five parked aircraft sustained shrapnel damage. Flight operations resumed by morning, as if the night could simply be set aside.

Zehra Yamaç was an airport cleaning worker — the kind of employee who moves through terminals and aprons largely unseen, keeping the machinery of mass transit running in the hours when passengers are not watching. In the immediate aftermath, Turkish authorities focused on flight operations: Transport Minister Binali Yıldırım announced that no security lapses had occurred at the airport. Journalists and aviation experts debated bomb signatures and shrapnel dispersal patterns. Through much of that early reporting, Zehra Yamaç's name was a footnote. Her life deserved more than that. She went to work. She died at work. The conflict that killed her did not begin at that airport, and it did not end there.

Four days after the attack, on 27 December, the Kurdistan Freedom Hawks — known by the initials TAK, an urban offshoot of the PKK — claimed the mortar bombing as an act of retaliation against the Turkish military's operations in Kurdish-populated cities in the southeast. The claim framed the attack as part of a broader armed campaign at a moment when the conflict had reached severe intensity: the peace process that had offered some hope since 2013 had effectively collapsed that summer. Turkey had been seeing bombings in Suruç, Ankara, and Diyarbakır across 2015. Istanbul's airports, busy and globally connected, became symbols as much as targets. An attacker was eventually arrested in Istanbul in October 2017.

Istanbul exists in the crosscurrents of Turkey's modern history — a city of 15 million people, many of them Kurdish, many of them recent migrants from the very regions where violence was concentrated. The attack at Sabiha Gökçen deepened an already acute anxiety about whether the country's largest city could remain insulated from the war in its southeast. It could not, and probably never could. Within months, Istanbul would suffer far worse attacks — including the devastating assault on Atatürk Airport in June 2016. Each of those events carried the same terrible arithmetic: ordinary people in ordinary moments, interrupted by political violence that had nothing to do with their own choices or actions.

The airport apron where the mortar shells struck has long since been repaired. Sabiha Gökçen International Airport continued to grow — it is now one of the busiest airports in Turkey, serving tens of millions of passengers a year. Most travelers who land or depart here know nothing of that December night. The investigation closed, the trial concluded, the headlines moved on. What remains is the fact of Zehra Yamaç's death: a cleaning worker, a night shift, a war that traveled further than wars are supposed to travel. Some losses resist the tidiness of context.