TSA PreCheck offers discount to younger travelers. Here's what to know.

Starting Friday, travelers ages 30 and under can save money by enrolling in the Transportation Security Administration's PreCheck program. In May, the agency will give young travelers $20 off the signup fee, which covers a five-year membership. That brings the cost of TSA PreCheck down to $56.75 and $65, depending on how travelers enroll, according to the agency. Enrolling in the program typically costs travelers looking to speed through airport security between $79.95 and $85. …