Respite from aircraft noise
Detailed and sometimes technical reports.
Queen Mary University: aircraft noise effects on health Click here
British Medical Journal (BMJ): Aircraft noise and cardiovascular disease near Heathrow airport in London: small area study Click here
Before the Airport started using satnav, departing flights were spread over a wide area - see here. The noise was shared - everybody got some respite from it.
Airspace in the North East is a very long way from full capacity there is no need to use satnav to increase capacity which is not needed.