Are you a good skier? Do you tackle the “black diamond” slopes without hesitation? Well, the TSA has a new challenge for you — the “black diamond” security line. In an effort to reduce the stress that travelers feel when families are holding up the security line — or when pushy frequent fliers try to cut in front of those families, the TSA has been testing a “self-select” program that allows fliers to choose which line they would feel most comfortable in.