An American Airlines Airbus A321-231 aircraft parked at Las Vegas' Harry Reid International Airport in January. (Photo by Artur Widak)NurPhoto via Getty ImagesAmerican Trails Rivals in Pre-Tax Profit MarginWith American Airlines under constant assault for its failure to match peer profit margin, two of the carrier’s top executives said Thursday that they fully expect to close the gap.Profit margin, expressed as a percentage, refers to the difference between revenue and cost. In recent years, American has tr ...