Black Sea, Bulgarian EEZOSINT
US ARTEMIS reconnaissance aircraft flies over Bulgaria’s Black Sea economic zone
The aircraft, callsign BRIO66, was spotted in public ADS-B data about 105 km from Cape Kaliakra. The flight was in international airspace above the Bulgarian EEZ.
A US electronic intelligence aircraft known as ARTEMIS flew over Bulgaria's exclusive economic zone (EEZ) in the Black Sea on 11 November 2026. Flank spotted it in public ADS-B data at about 15:12 Bulgarian time, around 105 km east-northeast of Cape Kaliakra, close to the boundary with Romania's EEZ.
The aircraft is a Bombardier Challenger 650 business jet with US registration N159L, ICAO address A0EC98 and callsign BRIO66. When it was observed, it was flying at 10,363 m (34,000 ft), at about 570 km/h and on a heading of 324°, that is, north-west. The data provider adsb.lol flags it as military.
Over the maritime zone, not in Bulgarian airspace
The exclusive economic zone gives Bulgaria rights over the resources of the sea, but the airspace above it is international. National airspace covers only the land and the territorial sea up to 12 nautical miles from the coast. A flight over the EEZ needs no permission from Bulgaria and is not in itself a violation.
Public data only show the aircraft's position at a given moment. They do not show what it was monitoring, where it took off from, or whether the flight is linked to a specific event.
A US Army reconnaissance platform
The specialist military aviation tracking website Itamilradar identifies the aircraft with registration N159L and callsign BRIO66 as a US Army ARTEMIS. The site described a mission by the same aircraft over the Black Sea in November 2025, noting that it usually operates over the Baltic region.
According to the US Army, ARTEMIS (Aerial Reconnaissance and Targeting Exploitation Multi-Mission Intelligence System) is a contractor-owned, contractor-operated reconnaissance aircraft. Sensors on these platforms relay communications intelligence (COMINT) and electronic intelligence (ELINT). According to Aviation Week, the first such aircraft was a Challenger 650 owned by the company Leidos.
Neither the US Army nor the Bulgarian authorities had commented on this specific flight at the time of publication.
Why This Matters for Bulgaria
The aircraft flew about 105 km off the Bulgarian coast, over the maritime zone where Bulgaria holds rights to the resources. It shows that allied reconnaissance over the Black Sea also passes Bulgarian waters, but it does not mean Bulgaria took part in the mission.
Sources
2 primary or official2 secondary reports
Primary / Official
ADS-B data (adsb.lol) · globe.adsb.lol
Flank observation: N159L / BRIO66, 11 November 2026Primary sourceOtherU.S. Army · army.mil
Advancing Army aerial ISR through acquisition, innovationPrimary sourceMilitary
Secondary reporting
Itamilradar · itamilradar.com
Intense US surveillance activity over the Black SeaOSINTAviation Week · aviationweek.com
Deployed Artemis Adds Jet To U.S. Army's ISR-collecting FleetOther
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