Travelers visiting select TSA checkpoints can give feedback on their experiences at new kiosks at Reagan National, LaGuardia, Los Angeles International and San Francisco International airports. The federal agency introduced the new kiosks to measure customer service, offering travelers the chance to share their emotions with the simple click of an emoji button. Options include a happy face, a somewhat happy face, an angry face or a somewhat angry face. Responses are streamed to customer service offices and subsequently summarized every hour so the government can improve its services to taxpayers and learn about their experiences.