I also had dreams of flying through the night sky. I'd get to the large piles of crushed rock down by the lake and would dive into them. Instead of crashing, as I got near the rocks would part. It always ended there. That I can recall.
Do you remember actually dreaming these things? The reason I ask is that a lot of my memories like this, I would tell myself that I must've dreamed it. That way, I could push them away and believe they weren't true/real.
I have memories of similar things to what you described here...of flying (not out of body, or in a craft) ...and some involved going to very far reaches of the earth (such as Antarctica) and the memories end with me going down into a huge crevasse...underground.
I do have out of body memories ...all of those involved trauma. My first out of body memory was around 18 months to 2 yrs. One of those involved being given LSD ...at least, I am pretty sure it was LSD. From other people's descriptions, it sounds pretty similar. My life was so filled with trauma, that by age 2, I learned that being outside the body was a lot safer than being in it. (I was severely fragmented, so parts of me were still in the body.)
@APAK may have some info on how drugs were used in MK Ultra.