United Airlines is making an equity investment in expedited security screening service Clear to add lanes at its Newark Liberty International Airport and Houston George Bush Intercontinental Airport hubs this summer. The carrier's partnership with Clear includes membership discounts for MileagePlus members: Those with Silver and higher can buy an annual membership for $109, regularly $179, and other members can buy it for $119. Global Services and Premier 1K members can get the membership for free. Clear and the city of Chicago are partnering to open lanes at Chicago O'Hare over the next few months, and Clear already has lanes in United's hubs in Denver, Los Angeles, San Francisco and Washington Dulles. Clear has had a similar partnership with Delta, in which SkyMiles members get discounted or free memberships, since 2016.