In message , at 10:00:49 on Thu, 20
Dec 2018, Marland remarked:

How long are the batteries lasting on this thing anyway .
Can’t help thinking there is more to this than has been made public, a
threat of another drone to be launched filled with explosives or something.

According to the TV news at breakfast time, it was being relaunched
often enough (but not necessarily for very long) to deem it not safe to
open the airport.
--
Roland Perry