Ground-based fuel storage is required
"Simple reality is that "renewable" aviation is going to have to run on synthetic paraffin. And that is going to be VERY expensive."
The problem here is that the aircraft has to carry its own energy (e.g., in the form of liquid fuel). If you could figure a way to leave that weight on the ground and only transport the payload itself (together with things required to control and protect that payload, such as seats, structure and control surfaces), you'd be home free.
Luckily, there is a way. Simply launch aircraft with ground-based electric capapults.
Naturally, you'd need some serious acceleration in the launch tube - 10g? 100g? lots anyway - but this need not be harmful to passengers or freight provided you have a suitable mechanism to cushion the launch impact, such as a very large rubber band.
Biting the hand that feeds IT
