For obvious reasons, all aircarft manufacturers are located at or near an airport or airfield. Sometimes they even have their own airfield. Its used to take delivery of parts, test their machines and fly out the finished product to customers under its own 'steam' or using a transport aircraft.
Usually, like Boeing at Paine Field or Airbus and ATR at Toulouse, a manufacturer will select an existing airport and locate a factory there. That means its traffic will be mixed with that of scheduled and charter flights operating out of that airport.
Antonov owns two airports which are part of its production facilities : Sviatoshyn Airfield and Hostomel Airport, both near Kiev in Ukraine. From Sviatoshyn you'd expect to see only Antonov and 'special' traffic, GML traffic on the other hand will be a mix of cargo and Antonov flights.
Turkish Aerospace Industries in Ankara, also has its own airfield. Its traffic is exclusive : test flights, suppliers, customers, either taking off with their new machine or flying in on the office jet for a meeting, as well as business partners jetting in for a chinwag.
Since none appears to exist it was added with the following valid and unique ICAO code : LT32
So far both the ATRs and Alenias modified and tested here have used CSX62.
Traffic to and from LT32.
Turkey