Before revision: February 22, 2010. by extension of the concepts of seaworthiness, for boats and ships, and of airworthiness, for aircraft, is a property, or ability of a spacecraft to perform safe flight, or navigate safely in space or in the atmosphere as a part of a journey to or from space.
After revision: February 22, 2010. by extension of the concepts of seaworthiness, for boats and ships, and of airworthiness, for aircraft, is a property, or ability of a spacecraft to perform to its design objectives and navigate successfully through both the space envirionment and the atmosphere as a part of a journey to or from space.