Last I heard was 78's now not due until Nov/Dec. Those that have been type rated are returning to their original fleets until further notice. Possibly waiting for 2 a/c to arrive at the same time - which would limit positioning crews around etc.
Apparently imperfections in the cabin (after Farnbrough) and wi-fi/ife install on A7-BCB plus I think the engine issues may have also helped push delivery back.
A7-BCL flew its first flight on Wednesday 26th.