god... why do people bother taking the regs off the bottle. I don't know where people got idea of that rule. You can fly with tanks. I've had my bag searched everytime i've flown with my gear and my regs were on, but they didn't do anything. All I do is have a on/off asa screwed onto my tank with the asa screwed in the "on" position. Technically you should be able to fly with pressurized tanks because the cargo area is pressurized anyway.
I quit paintball to open up a chain of WoofWoofBurger fastfood restaurants.