Reaction Engines plan Mach 5 Airliner
What is? writes "A British company has designed an eco-friendly airliner that could make a trip from London to Sydney in under five hours. Reaction
Engines has received funding from the
European
Space Agency to design the plane as part of the
Long-Term
Advanced Propulsion Concepts and Technologies project. The
A2
airliner would be capable of carrying 300 passengers at speeds of up to Mach
5."
You just cannot call it ECO friendly, if it deposits water vapor in the stratosphere. That is what is creating an ozone hole in the south pole larger than north america.