Bulgaria’s capital

This crossword clue is for the definition: Bulgaria’s capital.
it’s A 18 letters crossword puzzle definition.
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Possible Answers: SOFIA.

Last seen on: NY Times Crossword 11 Jan 22, Tuesday

Random information on the term “SOFIA”:

The Gerard P. Kuiper Airborne Observatory (KAO) was a national facility operated by NASA to support research in infrared astronomy. The observation platform was a highly modified Lockheed C-141A Starlifter jet transport aircraft (s/n: 6110, registration: N714NA, callsign: NASA 714) with a range of 6,000 nautical miles (11,000 km), capable of conducting research operations at altitudes of up to 48,000 feet (14 km).

The KAO was based at the Ames Research Center, NAS Moffett Field, near Sunnyvale, California. Prior to its conversion to the airborne observatory, it had served as Lockheed’s demonstrator for a potential civil version of the C-141.

Though it began operation in 1974 as a replacement for an earlier aircraft, the Galileo Observatory (itself a converted Convair 990 (N711NA) that was destroyed in a collision with a U.S. Navy Lockheed P-3C Orion patrol aircraft in 1973), the KAO wasn’t dedicated until May 21, 1975. The KAO flew at altitudes of 41,000 to 45,000 feet, and flew a total of 1,417 times.

SOFIA on Wikipedia