Using mixed mode at LHR
would enable some increase in movements, and frankly is the only way to expand at all if a third runway is denied and everybody doesn't want to use A380s. However the increase is not all that great. One of the key benefits would be the ability to reduce taxi times by using the runway nearest to a parking stand.
The fact remains that LHR
is Europe's busiest airport and it handles considerably more traffic than some other airports which have many more runways and more available land. I don't know another airport anywhere which is so desperately in need of a 3rd runway, and for all the complaints in that article opening a 3rd runway (this would be 2000 metres in length north of 27R/09L) could reduce the noise impact on residents at a given time because there are more runways to alternate around.
BAA has also said, if 3rd runway permission was given and compulsory land purchase necessary they will buy houses from residents where the 3rd runway is planned at prices before it was announced, enabling residents to move away from the noise.
Currently, aircraft land on one runway between 4am and 3pm and take off from the other the rest of the time and then vice versa for a week at a time
This is incorrect, up to 7am both are used for arrivals, but maybe best to keep quiet on that
Once you have tasted flight, you will walk the earth with your eyes turned forever skyward