Parsons Corp. PSN, +0.70% said Thursday it has won a contract from the Federal Aviation Administration for technical support with a ceiling of $1.8 billion. The Centreville, Va.-based provider of technology to the national security and global infrastructure markets said the contract includes a base period of four years with two three-year options. Parsons has provided support to the FAA since 2001. The stock has gained 16% in the last 12 months, while the S&P 500 SPX, -0.72% has fallen 9%.