“This could have been dealt with very quickly”
I don’t think so, or they would have. Its pretty clear they just do not have the equipment available to deal with such a situation, not even some kind of tracker drone to lock on and follow the problem one.
Unless they were discouraged by some unknown statement or factor from tackling the drone, this situation is horrifying, given drones have been openly developing for years now and that companies like Amazon are working to develop package delivery services with them (to carry significant weights).
Personally, I would say they have restarted flights because of one of the following:
– someone informed the authorities the ‘event’ had finished
– they have located someone controlling the drone but do not want to inform the public
– or most likely, someone paid up a ransom but they hope to catch the perpetrator later.