Delta wing designs will harry a lot of H2. It is suitable for LH2. Carbon fibre reinforced wing tanks. Efficiency is not as bad as other storage processes. Exportable/transportable fuel has huge advantages in monetizing surplus renewables.
Self-vapourising fuel is a major crash issue.
I don’t know about this. Vaporization does create a cooling effect, and having some battery can increase takeoff power and be charged during flight. Venting pressure release is an easy option.
Make US pay for NORAD too. If US wants golden dome, US pays for golden dome. US pays Canada to not host DPRK, Chinese, and Russian missile bases in Canada. Instead of waiting for them to steal our economy.