I belive it was edgar casey that also said that lighter than aircraft where used during the time of the pryamids and there construction.
A fact comes to mind when considering the building of the pryamids, given the condtions of the earth enviroment, atmosphere, there is very little oxygen in the air that is free as most of it is stored in the ice, this fact makes hard labor very difficult, a labor effort such as speculated by some to have taken place with manual labor as the means of moving such stones is almost improbable as there is little oxygen in the air to support such laborous efforts iun the human breath.
oxygen over the last 8,000 years has been released form its storage in the layers of ice and evaporation form the oceans, making our current breathing of oxygen content in the air higher than in the past or history of humans in the last 8,000 years. just as occurs today the oxygen content is slightly higher at the shore, this same fact would exist at the time of the building of the pryamids and just about any other time in the last 8,000 years, so when looking at old structures the predominate local for such structures will be near the shore.( with a few at high elevations which may also represent a change in atompshere causeing the migration of humans).
As the oxygen of the world is strored in ice layers as water, the ocean level is much lower than today, to find this elevation one would remove about 2/3rds the world oceans, to find the ocean level at the height of the ice age, at this new sea level is where you might find structures, places where humans built around the small oceans to get a better breathing gas.
humans in the very early part of the last 8,000 years where subject to changing atmopsheric condtions, at times they may have chosen to build at very high elevations to get a breathing atmopshere of oxygen.
if the pryamids or japanese pyramids, muchu picu ect where but at a certain time they would be built in a area where oxygen was the evaporated from the mist, and water vapors under sun light, more easly, if this certain time was relavatnt to the construction it would appear to them as though they where building on a very large mountain, as the oceans of the world where frozen in to ice, they could see the floor of the ocean where we would see only the surface of the ocean.
Therefor the type of building that would be seen as a form of construction would be simular to those found in carved dwellings, carved in the side of the mountain, this might lead to the formation of the pryamid structrue in concept.
The use of large stones in a enviroment that does not allow the physical body of humans to excert large amounts of labor, strongly suggest that the structures where not built by exstensive manual labor. where even a 1,000 years ago there was less oxygen content in the air. the use of gases such as nitrogen and or oxygen as a lifting device really becomes the only means plausable to account for the constrution of such large structures with large stone.
so here we see that edgar casey has some insight.
DDLR