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.
The plain English explanation is this: the 30th percentile means that if you have exactly this net worth, it is greater than 30% of households your age. The same is true for the 50th and 70th percentiles. So, broken down by age groups, here's what the median American's net worth looks like: For many in the older age categories, the value of one's house and property account for a large swath of overall net worth.