MYT aircraft will pop in from time to time no doubt.
G-NIKO was in NCL the other weekend oping the Sat AM NCL-ALC-NCL.
Seen the crew, they all had MAN ID's on, but the aircraft positioned in from and back to LGW, this could be because most of the NCL crew are now rated on the TCX 757 so not sure if they can still operate on the A321.
So it has been seen in NCL, but the based A320 has now left, went first few days of Nov.