Originally Posted by
marks7389
suggests G-BYGB upgraded, not G-BNLS.
http://ftdashboard.net now up to date to 30 December, with G-BYGB (and G-BNLV) but not G-BNLS highlighted as NF.
As to
henkybaby's travels, the thumbnail charts on
ftdashboard.net/overview/baflights.htm illustrate how BA55, on average, has indeed become a safer NF bet than BA57.