There is a stability issue with the tail section...in reality, the 777 already had this, hence the infamous "flutter" "fix" which makes the rear pax and crew seasick...
Rather that redesign the tail, which would have taken the ac out of rapid approval, BA chose the usual software fix...last test fight was what 8 months ago, and yet still no idea from BA what went wrong.
the results from several tests, as well as test flights, have been hidden, until this latest FAA report...
cert maybe by mid 2024?
Emirates was supposed to get the ac delivered in 2020....and they are not happy...now they must be livid.