The airspace change programme is essential if we are to contribute to and ensure the success of the UK's FAS.
The airspace above London is the most complex in the world and, as traffic levels increase, change is necessary to ensure safety and service levels."
More top news
The high of 35C was recorded on a Bakerloo line train between Piccadilly Circus and Oxford Circus at 2pm.
Weather forecasters say temperatures could reach 35C, beating the previous record of 34.6C in the scorching summer of 1976.
After years of political manoeuvring over the future expansion of Heathrow Airport, there has been an important development this lunchtime.