In warfare, airports can become the focus of intense fighting, for example the Battle of Tripoli Airport or the Battle for Donetsk Airport, both taking place in 2014. An airport primarily for military use is called an airbase or air station. Most of the world's airports are owned by local, regional, or national government bodies.
Age of viability. The age at which a premature baby can survive outside of the uterus. The age of viability occurs sometime between 22 and 26 weeks, usually when the weight is greater than 500 grams. The probability of survival is slim at 22-23 weeks, but increases to approximately 85% at 26-28 weeks. Respiratory problems are the most common complications that a preterm infant experiences.
This depends a great deal upon the state of medical knowledge and technology at a particular time and place. One hundred years ago, a child born at 30 weeks might have little chance of surviving. Today, 24 weeks is routinely quoted as the age of viability. I am not aware of any national statistics on how many premature babies of any given age manage to survive, but the following statistics are from a lecture by a doctor from the perinatal unit at a Dayton, Ohio hospital, for survival rates at that hospital.