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The one condition that can never be met is the total curfew between 2330 and 0600
At the moment there are shed loads of arrivals after 0430 until 0600.
18 available but only 14 used on any typical day - Hardly shed loads and NIL departures.
Today 4 are for Hong Kong ( not curfewed) through would mean a departure of around 1 am local - Some flight to Europe already leave around this including those to Manchester and Milan.
3 from Singapore including the daily BA Sydney flight - This would need to revert to a lunch time UK departure and mid afternoon arrival ala QF9/10 again doable.
Within the timeframe there is one US arrival either Boston or Chicago depending on season - This can easily be rescheduled.
Kuala lumpur has two arrivals at the moment - These again could be moved to day flights and who knows how long the MAS flight has left anyway.
The remaining are a West African and Middle East service easily moved.
Really the other end curfews are something of a red herring.