The document discusses trends in general aviation, including airspace modernization efforts around the world. It notes that many countries and regions, including Europe, North America, Mexico, Colombia, Panama, Ecuador and Bolivia, are mandating upgrades to aircraft systems like ADS-B Out and TCAS 7.1 by 2020 and beyond to modernize aging infrastructure originally from World War II. The global mandates could affect general aviation pilots who fly internationally or are involved with selling or buying aircraft. Upgrading aircraft needs to be considered to save costs, comply with regulations, maintain mission capabilities and gain operational efficiencies.