By the way, just saw a BA 777 in Memphis (MEM) three days ago. Maybe the first one to land there. The weather in DFW (Texas) had been bad, which motivated someone to choose MEM as the divert airport, instead of Little Rock (LIT) or Nashville (BNA).
Can a BA Captain always override their Dispatcher's choice of a divert airport (with no paperwork or debrief needed later etc), as long as things go well and the plane can get serviced/refueled/connected to a high jetway?
