Here is the latest :
Since the middle of January the plane has been under the care of, and was being being serviced by, Jet Aviation (Asia Pacific) Pte Ltd, a subsidiary of General Dynamics, an American Company.
My sources tells me that there are three possibilities as to the present location of the Jet:
Because the Jet Global 5000 N689WM has generated too much publicity, it has probably been flown to Paya Lebar Air Force Airport which is primarily being used by the Singapore Air Force (and at times by commercial cargo planes). There the Jet could easily be hidden from prying eyes.
Or the Jet could even have been flown to Changi - a huge airport where keeping the Jet under wraps in a hanger would also not be a problem
The other probability is that the United States Department of Justice have have had the plane serviced by Jet Aviation(Asia Pacific)Pte Ltd - a subsidiary of General Dynamic (an American Compay) and might have flown the Jet back to the United States where the plane is of interest to the DOJ in their 1MDB case.
All in all, the Jet has been at Seletar Airport since the middle of January.
I will keep you guys informed of any further development as they occur.