United Airlines (UAL) is benefiting from upbeat air travel demand. UAL's proactive measures toward sustainability and innovation are praiseworthy. However, weakness in liquidity and increased operating expenses are hurting the company's prospects. Factors Favoring UAL United Airlines' commitment to sustainability is commendable. The airline aims to achieve net-zero greenhouse gas emissions by 2050 and has purchased more sustainable fuel than any other U.S. airline in 2023. In September, UAL and the San Fran ...