The United program requires fingerprints and a background check . More travelers can enroll online years . TSA , airlines have for years sought to balance security with passenger convenience . Several airlines , including United , Southwest , United , and American participating .
The PreCheck program requires fingerprints and a background check . More travelers can enroll online later this year . TSA , airlines have for years sought to balance security with passenger convenience . Several airlines , including Delta , American , United , and Southwest participating .