If you’ve ever been through a large US airport, you’re probably at least vaguely aware of Clear. Maybe your interest (or irritation) has been piqued by the pods before the security checkpoints, the attendants in navy blue vests who usher clients to the front of the security line (perhaps just ahead of you), and the sometimes pushy sales pitches to sign up and skip ahead yourself. After all, is there anything people dislike more than waiting in line? Its position in airports has made Clear Secur...