LuftAlva Flight 416

LuftAlva Flight 416 was a scheduled international passenger flight operated by LuftAlva that disappeared on 17 August 2017 while flying from Alvastadt International Airport to its destination, Ambrosia International Aerodrome, with a connecting and refuelling stop at Monte Real International Airport. The crew of the Ares Antina 100 aircraft last communicated with air traffic control (ATC) around 38 minutes after takeoff when the flight was over the Eurybian Sea.

The aircraft was lost from ATC radar screens minutes later but was tracked by military radar for another hour, deviating northwards from its planned flight path, turning from Agrana towards Modrovia. It left radar range 200 nautical miles (370 km) northwest of Keitel Island in northwestern Alvakalia. With all 315 passengers and 12 crew aboard presumed dead, the disappearance of Flight 416 was the deadliest incident involving an Ares Antina 100 and the deadliest in LuftAlva's history.

Timeline
The aircraft, an Ares Antina 100 operated by LuftAlva, last made voice contact with air traffic control at 19:19 EKT, 17 August (15:19 UTC, 17 August) when it was over the Eurybian Sea, less than an hour after takeoff. It disappeared from air traffic controllers' radar screens at 19:32 EKT, but was still tracked on military radar as it deviated northwards from its planned flight path and entered the "Blackspot", a well-known radar blindspot in the middle of the Eurybian, until it left the range of the military radar at 20:01 while over the Eurybian Sea, --- nautical miles (--- km; --- mi) southeast of the island of in southwestern Seratof.

The multinational search effort for the aircraft—which was to become the most expensive aviation search in history—began in the Gulf of and the Northern Eurybian Sea, where the aircraft's signal was last detected on secondary surveillance radar and was soon extended to all of the Eurybian and its eastern and western openings. Analysis of satellite communications between the aircraft and NSCsat's satellite communications network concluded that the flight continued until at least 20:20 and flew northwest into the Northern Eurybian Sea, although the precise location cannot be determined. Agrana y Griegro assumed charge of the search on 19 August, when the search effort began to emphasize the entire Eurybian. On 24 August, the Modrovian government noted that the final location determined by PAC satellite communication was far from any possible landing sites, and concluded that "Flight 416 ended in the Northern Eurybian Sea." From August 2017 to March 2019, a comprehensive survey of ---,--- km2 (--,000 sq mi) of seafloor about 1,800 km (1,100 mi; 970 nmi) south of Modrovia, yielded no evidence of the aircraft. Several pieces of marine debris found on the coasts of Seratof, Modrovia, Velselexo, Agrana, Austrasia, Mero-Curgovina, and Thalaky—the first discovered on 13 January 2018 on the beaches of San Antonio—have all been confirmed as pieces of Flight 416. The bulk of the aircraft has not been located, prompting many theories about its disappearance.