Only yesterday from here in the middle of NI I was watching two large planes criss cross each other, one moving south right down the middle of Ireland from its origin in Norway, and another moving north-west to cross the Atlantic having come from continental Europe. Seen them both outside my window whilst also looking at them on flight radar, and while on the latter they were in direct alignment with each other, looking out the window I could see the one crossing the Atlantic was way higher, 2000 feet (or whatever the minimum distance these planes must be away from each other).
Found it fascinating how well orchestrated the traffic is controlled from the ground so had a discussion with my dad minutes after seeing this wondering how it works, how much sooner the planes are told where to go, like is it five minutes and then the screen flashes so the traffic controller then tells one of them to ascend or descend. Had maybe a 10 minute conversation on this and also thought my brother being a pilot of smaller aircraft would know (never got to talk to him though). And then wake up to hear this happen. Apparently the pilot on the helicopter got less than 5 seconds of a warning ('can you see the plane', and 'get behind it'). That's shocking.
Also the thought of a helicopter hovering around an airport also leaves me queasy. It's not like wild birds, but still they are not as predictable as airplanes in that they operate at different attitudes and also weave about. Don't think they should be anywhere near airports. And then you hear they got instructions from a different frequency to those of airplanes. Complete shambles.
Awful for all those poor souls who have died. Those on the plane coming into land would have been preparing themselves for getting off. May they all RIP.