BA now also requires use of F class on those flights which no longer have A class under their implementation of the AONEx product.
Code:
>$LB14
HISTORY
014 LONLON 01JAN19 BA GBP 9595.00 AONE3 STAY---/12MBK-A
FARE CLS EXPLANATION BOOK CODES
-------- ---------------------- ----------
AONE3 FIRST CLASS AROUND THE WORLD FARES A
AONE3 APPLIES FOR ROUND TRIP FARES
BOOKING CODE EXCEPTIONS
VIA BA F REQUIRED A- FARES BETWEEN LON-DXB
19DEC18-31DEC20
VIA BA F REQUIRED A- FARES BETWEEN LON-BOS
19DEC18-31DEC20
VIA BA A REQUIRED WHEN AVAILABLE ALL FIRST
(snipped)
I would expect this change to be formally incorporated into the rules soon enough.