United Airlines' share price has more than doubled in 2024, outperforming competitors.The airline benefits from its hub airport structure and has been smart with deploying capacity.Strong finances and planned share buybacks have also helped.United Airlines may be Boeing's biggest customer, but the two companies have had wildly different years.Advertisement A quality-control crisis and seven-week labor strike have led to layoffs, increased regulatory scrutiny, and — perhaps most problematically — production ...