Instead, Boris will talk to business leaders later today about his 'dual vision': an area the size of the borough of Kensington and Chelsea on the Heathrow site housing 180,000 people and creating 40,000 jobs as well as a new airport in the east of the city.
He told Simon Harris that closing Heathrow would bring about massive economic growth in the area.
The Mayor is also due to claim in his speech later, that the proposal to add a second runway at Gatwick offers absolutely no kind of solution to the problem.
Gatwick already has the capacity to provide more flights but Mr Johnson says that airlines frustrated by congestion at Heathrow are well aware that the greater number of transfer passengers found at mega hub airports will offer them larger profits.
Airlines are therefore choosing to move to Schipol or other hub airports - instead of Gatwick, he says.
A report out today claims that replacing Heathrow with a new hub airport would leave passengers, taxpayers and business worse off. It says a third London airport runway is essential if capacity is to be increased.
The study will be presented as evidence to the Airports Commission and argues against a new airport in the Thames Estuary, Isle of Grain or Stansted.
Earlier we spoke to John Holland-Kay, development Director at Heathrow.
Adding capacity at Heathrow would also be better for passengers and for jobs than anew hub airport at Stansted or in the Thames Estuary. Expansion could be delivered around seven years quicker than the time taken to build a new hub airport says the report by Heathrow bosses.
Creating a new airport would increase travel times for 90% of hub passengers, with the economic cost of longer journeys amounting to a possible £26 billion.
Adding capacity at Heathrow would also be better for taxpayers, with a new airport needing around £25 billion of public money, the report claims.
More than 76,000 people directly employed at Heathrow would face re-location or redundancy if Heathrow was replaced by a new airport.
The report also said that the area round Heathrow in west London was home to 202 of the UK's top 300 company headquarters.
Mayor Boris Johnson is one of the leading supporters of a new Thames Estuary airport and vehemently opposes the building of an extra, third, runway at Heathrow.
Labour backed the third runway plan in 2009 but the expansion was scrapped by the coalition Government, which has now set up an Aviation Commission under former CBI chief Sir Howard Davies to look into the whole question of airport capacity.
Today's report has been compiled by Heathrow Airport with architectural and planning consultants AECOM and Quod.
The report will form part of Heathrow's submission to the Davies Commission.The commission will publish its interim report by the end of this year and its final report in the summer of 2015.