That concern has led to calls for a fleet of European firefighting planes.
He added that Fastjet was making unrealistic revenue forecasts for a fleet of six aircraft.
On Thursday, the mayor cancelled the contracts for a fleet of hydrogen vans, cars and motorbikes.
The city also recently installed fueling stations for a fleet of electric cars it plans to lease to residents.
He is still rehabilitating and regaining strength in his knees, which is vital for a fleet center fielder.
There are endless infinity-edge pools, remote-control fire pits and oversize garages ready for a fleet of Porsches.
And it will buy 250 hybrid buses, making for a fleet of 390 at the end of the capital plan.
For example, Mr Rutan's follow-up vehicle, SpaceShipTwo, is expected to cost its backers, Virgin Galactic, $240m for a fleet of five.
European directives have brought average levels down by about a fifth in the decade to 2012, to 132 grams (4.7 ounces) per kilometre for a fleet average.
Andreas Baum, who as head of their Berlin caucus is entitled to an official car, wants to trade it in for a fleet of bicycles.
Professor Stephen Salter has produced a blueprint for a fleet of 60m-long "road ferries" that would be loaded with vehicles before crossing the bridge.
