Very interesting.
Yea,but I’ve always questioned those reports, you know...pilots, they’re the ones that claim to see UFO’s and such. My guess...oxygen deprivation.
Few years back I flew in a light plane from Lake Peten in Guatemala to Belize City. We were at fairly low altitude and the pilot pointed out several Mayan sites he said were not yet visited and mapped. It's a very large, heavily forested region.
Having hiked a bit through the dense jungle with a guide near Tikal, I can easily understand how difficult it is to see and access those ruins from the ground. I visited Caracol in Belize, which is only partly excavated, and there are several large pyramids you can't see from the ground until you practically walk into them.