"flying the A350-1000 Xtra engine" as the sticker says - while a row of A320 neos, in long-term parking configuration, await the arrival of their own engines.
"Trent XWB 97" Test Bed
Flight test engine will be installed A350-1000
New engine Roll Royce "Trent XWB 97" which will be installed on future A350-1000
Paris Air Show 2015