A pair of Turkish F-16 fighter jets flew over the southeastern Aegean islands of Lipsoi and Arkioi on Tuesday without authorization.
According to an announcement from the Hellenic National Defense General Staff (GEETHA), the pair of jets entered the Athens Flight Information region (FIR) without having previously submitted a flight plan, at 1.26 p.m.
The Croatian Defence Ministry said on Monday that a military helicopter had crashed into the Adriatic Sea that morning, killing the pilot.
It said the air force OH-58 D Kiowa helicopter crashed between the island of Zlarin and the coastal town of Zablace near Sibenik. The pilot was confirmed dead while the search for the second crew member was ongoing.
He told CNN that the FBI's evidence-gathering team was on site and assisting local authorities with the investigation.
The Federal Aviation Administration and National Transportation Safety Board are investigating the crash and will determine the official cause. The FBI is also assisting the investigation, a standard practice.
Turkish Airlines announced on Friday that it aimed to carry 78-80 million passengers in 2020, mostly on international routes.
Nearly 14.8 million passengers transited, in 2019, the "Henri Coanda" Bucharest International Airport and the "Aurel Vlaicu" Bucharest-Baneasa International Airport, up 6.39 per cent on the previous year's figure, show data released by the National Company Bucharest Airports (CNAB) on Tuesday.