I just want to throw out there that you're not wrong but keep in mind that there's a pretty big difference between operating 100ft off the ground in Denver and

I just want to throw out there that you're not wrong but keep in mind that there's a pretty big difference between operating 100ft off the ground in Denver and operating 1 mile above Los Angeles. Know why? You need enough battery/fuel to climb 0.99 miles minus 435ft in L.A. (and presumably safely descend) through progressively thinner atmosphere, in Denver you need need enough battery/fuel to climb 100 ft in thinner atmosphere. The amount of planes flying 100ft above the terrain is considerably less than those that are operating between 100ft and 0.99 miles above the terrain.