This work monetizes the environmental benefits of Terminal Flight Data Manager (TFDM) capabilities which reduce fuel burn and gaseous emissions, and in turn reduce climate change and air quality effects. A methodology is created which takes TFDM "engines-on" taxi time savings and converts them to fuel and carbon dioxide (CO2) emissions savings, accounting for aircraft fleet mix at each of 27 TFDM analysis airports over a 2016-2048 analysis timeframe. Total fuel reductions of approximately 300 million U.S. gallons are estimated, resulting in monetized benefits from all TFDM capabilities of $65m-$582m undiscounted, $23m-$310m discounted, depending on the Social Cost of CO2 (SCC) and discount rate used. A similar methodology is used to estimate monetized benefits of reduced air quality emissions as well.