The BA brand at Gatwick is strong particularly the Holidays division. I expect BA will use a lot of the slots. BA have a few airbus deliveries next year. Easy enough to keep older ones longer than expected. Don't forget there are also 30 or so ex monarch aircraft seeking new homes. Perhaps a couple more 777s based at LGW too. Level have two aircraft at the moment with another 3 due but also proposed new bases in mainland Europe. I also believe BA long haul from Gatwick makes good money already. Other airlines in the group may use some of them. However for the time being I think BA at Gatwick will use most of them.