Yep, optimization. I did at some point napkin on cargo Zeppelin 3-4 days vs 747 in half a day Shanghai to SFO. Zeppelin would burn almost the same fuel, and ul

Yep, optimization. I did at some point napkin on cargo Zeppelin 3-4 days vs 747 in half a day Shanghai to SFO. Zeppelin would burn almost the same fuel, and ultimately 747 would provide higher ROI due to more flight over the same time period.