Right, so you have to build in slack yourself, i.e. you can't rely on the "high punctuality" of 75%. They might as well be 1% punctual and, unless the amount of

Right, so you have to build in slack yourself, i.e. you can't rely on the "high punctuality" of 75%. They might as well be 1% punctual and, unless the amount of delay also increases, it wouldn't change a thing.