That is the registration number the Swedish transport agency recently granted the Swedish Air Force Historic Flight for their AJS 37 (37098) Viggen.
Now SwAFHF got to provide documents on how they plan to operate the jet to get the airworthiness certificate. Control flight is scheduled before the end of April.
The ambition is then to have the jet, pilot and techies ready for displays in time of the June celebrations in Linköping. (I believe it's 100yr military aviation and Saab 75th bday)
Translating from source (Swedish) http://swafhf.se/Start2012.html
