The hydrogen and flying wings are the concepts for commercial flights of tomorrow.

Image: NASA

The hydrogen and flying wings are the concepts for commercial flights of tomorrow. 

Hydrogen is an emission-free and promising fuel if it is produced by using environment-friendly methods. Hydrogen fuel for the engines and the flying wing form of the aircraft can save the aircraft as the transporters. Hydrogen is emission-free fuel if it is produced by using environment-friendly methods. One of those methods is geothermal energy, which can give electricity for the electrolysis systems, and that thing can make countries like Iceland and other volcanic areas large energy suppliers. 

Geothermal energy is stable, and it is weather independent. Another way to make hydrogen weather-independently is to use solar panels that are above the cloud layer. Transforming electricity to hydrogen makes it possible to transport energy in long distances and it can burn in power plants like methane and other natural gasses. 

But as you see hydrogen is an excellent fuel for aircraft, if the systems that can handle that liquid gas exist. But that thing requires investments and in this case, the question is about money. The thing is that changes are necessary for aviation or the airlines would price themselves away from the transportation markets. The main problem of aviation is carbon dioxide emission which is huge in the compilation with things like ships and trains. 

The carbon dioxide emission is calculating by using the formula (number of persons/ produced carbon dioxide during the journey), and the thing that would determine the environment-friendliness of the travel is the produced carbon dioxide and other pollution per person. And the thing that makes the train friendlier for the environment than aircraft is that there are more people than in airplanes. So the carbon dioxide load would divide for more people than in airplanes. 

The use of liquid hydrogen and change the shape of the airplanes would cause pressure for changing the structures of airports. But that thing is one of the prices what the aviation industry should pay if it wants to keep it's product competitive. The flying wing and hydrogen are not new propellants in aviation technology. The rockets are used the liquid hydrogen and oxygen for a long time. 

The flying wing or blended wing aircraft uses half of the fuel than normal-shaped aircraft.

The flying wing or blended wing concept is not new. It was invented in Germany 1930s and it is used in military B-2 and B-21 bombers, and probably some other stealth and recon aircraft. Hydrogen is used already in the high-speed test planes, and the hypersonic systems as fuel, because it helps to keep the temperature of the body of the aircraft lower. 

Sometimes has been introduced ideas that the naval aircraft would start to use hydrogen as fuel because its easy to produce by using the electricity that can produce by using nuclear reactors of the aircraft carriers. The hydrogen is a promising fuel for turbines because it acts like methane, and hydrogen can produce easily from the water. 

Sources:

B-2: https://en.wikipedia.org/wiki/Northrop_Grumman_B-2_Spirit

B-21: https://en.wikipedia.org/wiki/Northrop_Grumman_B-21_Raider

Hydrogen as fuel: https://en.wikipedia.org/wiki/Hydrogen_fuel

List of Flying wings: https://en.wikipedia.org/wiki/List_of_flying_wings

Fuel economy of flying- or blended (hybrid wing) wing; https://www.businessinsider.in/Hybrid-Wing-Plane-Uses-Half-The-Fuel-Of-A-Standard-Airplane/articleshow/21420771.cms

Image: https://www.businessinsider.in/Hybrid-Wing-Plane-Uses-Half-The-Fuel-Of-A-Standard-Airplane/articleshow/21420771.cms