altitudes

For obvious reasons, the accumulation zone for a mountain glacier will be at higher altitudes, and the ablation zone will be at lower altitudes.

Unfortunately it is not accurate below 250ft, the wind is not linear and this kind of model doesn't count well enough all the obstacles at the low altitudes.

If you could make beamed power work, you wouldn't have to haul your power source up to those altitudes.

The high pressure ratio allows the engine to continue to provide high thrust at very high speeds and altitudes.

If you have some mix of baro and GPS altitudes, you can no longer safely ensure separation.

If airplanes just went to random places in the sky at random altitudes, then indeed accidents would be rare, but everyone heads towards airports, which have particular traffic pattern altitudes for instance.

How is a turbofan/turboprop engine going to work in the thin air at these high altitudes?

Also depending on the quality of your fix, you'll have different altitudes to the rest of the people around you.

Just to put a number on it, the cabin pressure at high altitudes is given by Wikipedia as around 0.75 atm.

Time passes at different rates at different altitudes, and relative velocities also screw with you.

At lower altitudes (which a bomber interception would be, relatively speaking) the electrons don't get far enough before they collide with stuff.

The coffee grown there had no resistance to the disease - the crop relied on the protection of low temperatures at higher altitudes.

It turns out that it's very feasible; Venus' carbon-dioxide-based atmosphere would be thick enough even at those altitudes to keep a "balloon" filled with an Earth-like atmosphere (nitrogen, oxygen, trace CO2) afloat with little effort.