There’s a fair number of conundrums to be considered. Will the four B77Ws arrive on time, will A350 and B781 deliveries arrive as planned, will A380 flights have to be de-risked further because there won’t be any B747s as a back-up when an A380 goes tech, will LHR LH flights take precedence over LGW leaving a few aircraft available to operate LGW LH routes.