Mostly correct but the airport does not close at night - it's H24 - nor do runway inspections usually take place at that busy time; they're done beforehand. A fair number of flights do arrive from the early hours but these are airlines using up their night allocations. Most are not allowed to land until 6am, which accounts for the holding which takes place while they wait.
Last edited by HEATHROW DIRECTOR; 7th Nov 2010 at 10:18.