[dmitrygr]

People say stuff like this a lot, my guess is that you don’t fly airplanes. The fact that the airplane gets lighter as it burns fuel is kind of important and is used to simplify airplane design a lot (check out the difference between MTOW and MLW of a 777) . Batteries don’t get lighter.

[kurthr]

To be polite, my guess is you've never tried storing dense hydrogen or running high power fuel cells. The solutions are large, heavy, expensive, and not very safe in enclosed areas. The solutions under consideration involve batteries for backup.

[dmitrygr]

I never said H2 is the solution (I do not believe so). I just said that batteries are NOT.

[kurthr]

Who (other than ZeroAvia) is talking about batteries for flight?

For more information, please reread.

   "the cost of building safe low leakage infrastructure might exceed the cost of 
   batteries and solar/wind to produce power. You're probably better off making H2 
   dynamically where you need it and just sending electrons or storing them locally 
   in safe batteries."