SA Novespace of France operates an Airbus A310 (F-WNOV) to perform 'parabolic' flights. During these flights, the aircraft simulates weightlessness for a short period of time. The cabin of the aircraft is therefore mostly empty, to give people the space to float around.
I've seen a video about this plane by Tom Scott years ago. But I only recently learned this is an A310. Learned so by browsing the liveries of the IniBuilds A310 for MSFS, and there it was! It's a very cool variant for sure.