I suspect that any development plans will be put on hold as a result of Brexit, at least until such time as the owners and airlines see what impact there is on flights to/from the EU. An immediate effect of course will be the hit on outbound holiday routes due to the now ever decreasing value of the pound, although of course this might be balanced by increases in inbound tourism. Then there is the possible impact on carriers, particularly Ryanair and EasyJet, of the UK being forced out of the European Air Services Agreement. It is indeed only one small part of a can of worms which has been opened, none of which not even BoJo anticipated by the looks of it.