This summer, Delta will test a facial recognition system for checking luggage. The airline says that the move is an effort to save customers time and further streamline the pre-flight process. "One machine will be equipped to test facial recognition technology to match customers with their passport photos through identification verification," the press release says. The $600,000 pilot program's four machines will reside at the sprawling Minneapolis-Saint Paul International Airport. The news comes after recent word that domestic airports would start using biometrics for registering travelers when they leave the US and return.