We can't retrofit existing aircraft. We will need design and testing for different engine types and various aircraft in use (short haul, medium to long haul intercontinental). Then there is the issue of manufacturing. Sure, we can phase retirement and rollout but it's not just the planes.
We need training for mechanics so they can maintain systems. Airports need to be modified to allow fueling and maintenance of hydrogen cell aircraft. We can't just have certain cities and ports, what happens in an emergency landing? The plane is grounded?
Then there is regulation and internation agreements. Nearly every country cooperates when it comes to the aeronautical industry. What happens when poor countries are unable to retrofit their infrastructure. Who pays?
As I said, I think it's awesome this is being tested but this is all hype by tech media and its rather disingenuous. Those startups aren't going anywhere. Airbus told the EU they wouldn't be ready until 2050 and they are more driven by sustainability than Boeing at this point.
Lastly, unless the market changes, no one can afford hydrogen. Airlines spend roughly 20% of their budget on fuel. Hydrogen would increase that cost to 50 to 60 percent. That alone will stop any advancement.
These articles are like the hype over the successful fusion experiment. "It's going to revolutionize the world" no it won't and it hasn't. I swear, the media will sensationalize the senior editors mother's new church hat if it meant creating a buzz and generating ad revenue.
Sorry to be a downer. These articles annoy me
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