From CXAgents.com (essentially that Binter Mediterranean is no longer a OW Affiliate; BA Connect is just a rebranding of BA Citiexpress, although it there will be no J class on BA COnnect):

ONEWORLD FARES - BA/IB AFFILIATES AIRLINES REVISED

Please be advised that BA and IB Affiliates Airlines that applicable
to travel on ONEWORLD fares are revised as below with immediate effect:


BA - BA CONNECT, BMED, COMAIR, GB AIRWAYS, LOGANAIR,
SUN-AIR
IB - AIR NOSTRUM