Delta acquired a bunch of A350s when airlines were disposing of them and they have progressively been heading from storage at Victorville to Singapore for reconfiguration.  I have posted about these already with a couple of LATAM jets having come through.  The most recent one I saw was actually an ex-TAM aircraft.  Again, not the best of conditions for shooting its arrival but it was still fun to see something you would normally never see at SEA.  It was a bit damp so there was a little vapor over the wings which was nice.  Next time I see it, it will be indistinguishable from the other Delta A350s.