Valued at a market cap of $33.7 billion, United Airlines Holdings, Inc. (UAL) provides air transportation services. The Chicago, Illinois-based company transports people and cargo through its mainline and regional fleets and also offers ground handling, flight academy, and maintenance services for third parties. This airline company has underperformed the broader market over the past 52 weeks. Shares of UAL have declined 1.3$SPX) has gained 15%. Mo ...