parsons corp psn said thursday it has won a contract from the federal aviation administration for technical support with a ceiling of 18 billion the centreville vabased provider of technology to the national security and global infrastructure markets said the contract includes a base period of four years with two threeyear options parsons has provided support to the faa since 2001 the stock has gained 16 in the last 12 months while the sp 500 spx has fallen 9