Incheon International Airport will deploy robot guides that can escort travelers to immigration and baggage claim areas from July 21, in time for the summer peak season. The airport said it is first in the world to put robots into service, as opposed to testing them. The second-generation robot, dubbed Airstar, is an upgraded version of guide robots that were tested in the airport last year. Airstar robots have improved driving and voice recognition features compared to the test versions and are also capable of expressing 14 different emotions. The self-driving feature was upgraded by using more sensors including three-dimensional camera sensors that help avoid obstacles and ultrasonic sensors that recognize very close objects, the airport said. As for voice recognition, the new robot is designed to distinguish voice commands from other noises in the airport.