To get an idea of the consequences, have a look at flightradar24. Ten days ago, probably more than half of the flights towards the Canaries were from or to UK airports. Now, there are hardly any - and the total number of airborne aircraft between Portugal and the Canaries is at best half of what it used to be a mere week ago. Good illustration why the difference between the coordinated measures and the uncoordinated measures scenarios calculated by Eurocontrol is so significant.