The hyperloop calculations are way off. the longer the tube, the thicker it has to be to support itself.

Instead, "aerial airstrip" on slide 21 would make a ton of sense. Move airports from the ground to above the clouds (3km up in the air?). Advantages:

1) 10-15% less fuel consumption (after take-offs you are already at 3km altitude)

2) much less noise for the surroundings

3) less subject to bad weather conditions.

etc.