They’ve paid down significant debt, and they have similar future obligation commitments in line with Delta and far below American (largely because of American’s huge aircraft orders the last several years and into the future, but also because of low pension obligations — remember United moved a bunch of this liability onto the federal government’s Pension Benefit Guaranty Corporation in bankruptcy while legacy American Airlines did not).
Here’s the United fleet plan he laid out, showing that the airline should end 2017 with the same number of aircraft as 2016.