Question about the Stratospheric Observatory for Infrared Astronomy, SOFIA for short.

The Stratospheric Observatory for Infrared Astronomy, short SOFIA, is a flying telescope developed by NASA together with the German Aerospace Center (DLR) for infrared astronomy. For this purpose, a reflecting telescope was installed on board a converted Boeing 747SP (short long-haul version) with the registration N747NA. SOFIA has been in operation since November 30, 2010.