United Airlines has introduced plans to start rolling out Clear’s biometric prescreening at its hub airports. The system works by verifying a flier’s fingerprints or eye scan. Clear already is offered at about 60 areas all through the United States. It presents a system that makes use of biometrics to hurry preapproved vacationers to the entrance of the safety lane, and even forward of TSA Pre-Check fliers. There now are not less than 53 biometric techniques used simply by the aviation business.