Andrew Chang is the managing director of United Airlines Ventures, the investment arm of United that’s focused on deploying capital to new technologies from sustainable aviation fuel to digital technologies across the air travel spectrum. Chang, who’s based here in Houston, explains some of the challenges to innovating in the massive, global industry that is aviation — as well as tackling the airline’s goals to become more sustainable. He also shares what he’s looking for from startup founders and the role United plays to its portfolio companies as a whole.