Originally Posted by Globaliser

As for LF taking LU's NF cabin, they are both mid-J aircraft, so it may well have been that mid-J routes could not have tolerated both LF and LU being out of service at the same time. So could LF's C-check (or whatever) have been deferred until after the NF cabin was removed from LU? And could mid-J routes have coped with LU being withdrawn now, and then LF later being out of service for some time for the re-fit? Possibly not - but we can't know one way or the other.