On the cover of Feb. 2008 Popular Science, shows a new jetliner call the A2, the A2 is Hydrogen Hyper-jet airliner design to carry 300 passengers at the speed of Mach 5. The A2 do not have any windows due to it speed, also due to it's four Scimitar engines it is a clean burning jet. As written in Popular Science, For takeoff, landing and subsonic flight, the A2's Scimitar engines sends intake air through a bypass duct and into a turbine, like a standard jet engine. After reaching supersonic speed, though, the engine redirects air from the bypass duct through the engine core for flight up to Mach 5. Like a ram jet, the Scimitar works by taking in air from the atmosphere at high speeds and funneling (or " ramming") it until it's intensely compressed. At this point, the extremely hot air mixes with fuel and causes ignition. But the Scimitar one-up traditional ramjet design by adding a turbine that compresses the incoming air even further. Ramjets usually can't use turbines because the incoming air is so hot that it will melt the turbine blades. The Scimitar solves that problem by first cooling the air in a heat exchanger using gaseous helium.
So, could the A2 work, and if yes , do you think passengers would want to trade in windows to make a 22 hour flight only 4 hours?