An engineering expert is to advise the London mayor on the possibility of building an airport in the Thames Estuary.
London offices could benefit from the transport hub as it would make the city more accessible to international clients.
Executive chair of Crossrail Doug Oakervee has agreed to help Boris Johnson decide whether building the Thames Airport would be feasible.
The mayor’s director of transport Kulveer Ranger said: “Doug brings a whole range of engineering skills, from tunnelling and construction to planning and design.
“His conclusion will be based on thorough and detailed analysis and will be crucial in aiding a final decision on the feasibility of an airport in the Thames Estuary.”
Mr Oakervee said he was “looking forward to working closely with the mayor and his team as we evaluate this ambitious scheme”.
If given the green light, the project is expected to create between 100,000 and 200,000 jobs.