The A340-600s have two daily departures, JFK around 1300 and Fuzhou, China around 1900. I think the JFK route is tied up with Amazon and the China route is for the NHS carrying PPE and Covid test kits. They are able to carry around 70 tonnes of cargo, 25 to 30 tonnes in the lower holds and the rest on the main deck loaded through the passenger doors.
The Falcon 20s operated by Draken are part of the FRADU (or whatever it's called now), operation for the Royal Navy and have been doing this since the mid 1980s.
There can often be 4 aircraft departing in quick succession particularly on Thursdays when the Navy have their "Thursday War".
Hope this helps.
PS. I like your use of "Hurn", as it has always been that to me in my many years of visiting and working there.