United Airlines is making its second large order of new planes in less than a year, again seeking a mix of 110 aircraft from Boeing and rival Airbus as it renews its fleet. The most recent order announced Tuesday will include 50 Boeing 787-9s, and 60 Airbus A321neos. The agreement comes with options for up to 50 more Boeing 787s and for an additional 40 A321neo aircraft at the end of the decade. In December, United ordered 100 new Boeing 787s to replace planes nearing retirement age and to expand its international flying. The company ordered 200 Boeing Max jets and 70 planes from Airbus in June 2021.