Happened to me about 10 yrs ago, except I was not sole passenger- there were 3 of us. I had fallen asleep in the departure area and missed my flight. They told me to come back next day so I did, Freaky to see hundreds of empty seats and crossing the Pacific ocean. One other passenger was a special case fear-of-flying. The other was so far away I had no idea what they were about. I did not check first class, maybe somebody in there. Weird but I was focused on getting to my family so I was just grateful.