British Airways now says that the costly shutdown of its ticketing and reservation systems in late May was caused by — wait for it — someone flipping off the switch on the power to its computer. Hundreds of canceled flights were the result of this thoughtful attempt to save the airline a dime or two on power. According to The Times, it’s apparently that easy to take down an entire airline. It says the airline’s investigation first centered on whether or not the data centers’ power supply unit was working correctly. Ultimately, the airline concluded that there wasn’t anything wrong with the power supply, other than a human had turned it off.