At today's conference Sir Howard Davies said that with the estuary option there was the "simple challenge of distance", with the schemes being some way from central London. He added:
The economic implications are quite serious as well, such as what would be the effect of closing Heathrow and London City airports.
The accusation comes as the mayor's aviation adviser uses a speech to launch a bitter attack.
London's Mayor was said to be "profoundly unsettled" by a report which sidelined his proposal for a new airport in the Thames estuary.