Filled out and filed at mufon headquarters, with witness on the phone, by field investigator l. flechtner 18809 on tuesday 9/19/17. i was out side about 10:30 to 11:00 am looking at the mountains. i saw this bright white object straight up in the sky over me. i couldn't tell if it was white or the white was light. it was cylinder shaped and had a dome on top of it. it came straight down as it got closer, i could see that the dome was rotating and possibly had windows. it was about 5 miles away at this time and it started doing every conceivable acrobatic move i could describe. it didn't seem a human could be inside of it. it was as big as a 747, i used to work at the airport so i am familiar with aircraft and this was not one i had seen before. it moved straight up and down and then stopped,then it put on a show doing the acrobatics. i first saw it in the southeast and it left going north. i waved at it. this whole event lasted 10 minutes.