Now the rules are clear, and they make sense. For the pilot, you need supplemental oxygen when you are between 12,500 and 14,000 feet for more than 30 minutes and above 14,000 feet at all times. Passengers must get oxygen at 15,000 feet. This is a good rule. It would have kept me from climbing through 14,000 feet, maybe even 12,500, since I had no oxygen supplies on board. And with oxygen in my veins at a lower altitude, I would never have intentionally violated an FAR.