American Airlines CFO Derek Kerr said FY2018 RASM was up 2.4%, while RASM in 4Q2018 was up 1.7% (Seeking Alpha, 24-Jan-2019). He noted the growth was due to enhancement of the airline's revenue management system (RMS) and the positive impact from its basic and premium economy products.
American Airlines improved RASM due to enhanced RMS and basic/premium economy product: CFO
29 January, 2019