JetBlue, Frontier, Southwest, AirTran & WestJet see yield pressures - ancillary revenues crucial

North American LCCs, JetBlue, Frontier, Southwest, AirTran and WestJet, have all reported pressure on unit revenues in recent months and the near-term outlook is also challenging. For Southwest, the weak outlook for passenger revenues per ASM (PRASM) is of concern considering its push into key business markets lately.