If you're flying out of Luis Muñoz Marín International Airport (SJU) in San Juan, Puerto Rico , you may be wondering if TSA PreCheck at SJU Airport  or CLEAR  can help you get through security faster. Both programs can speed up the process, but they work differently. Here’s what you need to know before your flight. What is TSA PreCheck? TSA PreCheck is a trusted traveler program  that allows low-risk passengers  to go through an expedited security screening  process. If you h