Google "sec.gov edgar" to get to the US Government database of corporate filings.

Look up the financials for the top four American Airlines: American, Delta, Southwest, and United.

Conduct a horizontal analysis for gross revenue, operating profit, net profit, size of balance sheet, and cash from operations. 2017-2019.

Determine the current ratio, debt ratio, and earnings per share for each year for each.

Conduct a horizontal analysis of these three ratios for each company. 2017-2019.

Graph the results you get and post them here. Then answer the question: which of these four looked best positioned to survive the losses they are now incurring due to the pandemic, based on their numbers?