NEW YORK (S&P Global Ratings) Jan. 30, 2018--S&P Global Ratings said today that its 'BB-' issue-level rating on United Airlines Inc.'s City of Houston airport special revenue bonds (United Airlines Inc. technical operations center project) series 2018 and (United Airlines Inc. airport improvement projects) series 2018C remain unchanged. United originally planned to offer these bonds in November 2017 (when we assigned our 'BB-' issue-level rating to the then series 2017 and series 2017C bonds), though the offering was eventually delayed. The company plans to use the proceeds from these bonds to finance new facilities, and repair and improve some of its existing facilities, at George Bush Intercontinental Airport. The bonds rely on lease payments from United Airlines Inc. to the