Business leaders say reducing the number of night flights to London airports would be damaging to the economy.
It comes as the London Assembly has called on the Government to end the flights at night altogether.
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The victim, who was also 15, was stabbed repeatedly just yards from the Capital City Academy School in Willesden.
Crossrail contractors have been hit with a fine of more than a million pounds over the death of a worker and other incidents.
Anh Nhu Nguyen, 52, claimed he lived in the North Kensington block and that his wife and son had died in the fire.