Operational costs and total costs definitions vary from person to person. My Son is studying Aerospace Eng at Uni. He is paying about £9000 a year for his tuition and spends about 1000h studying. I wanted to learn about aircraft, built one and now maintain it. I consider it a useful learning exercise so do not consider my time as an expense.
The only other costs would be interest on the capital and depreciation. The aircraft is worth roughly what it cost so depreciation is negligible. Interest would be running at about £1k pa.
Rod1