Southwest Airlines raised its third-quarter revenue forecast, authorized 2.5billioninsharebuybacksandannouncedaslewofchangestoitsbusinessasitcontinuestofacepressurefromactivisthedgefundElliottInvestmentManagement.Thecompanysaysitsbusinessplanwillrakeinanadditional4 billion in earnings before interest and taxes by 2027.Southwest said it expects unit revenue growth up to 3% in the third quarter compared to the same period last year – up from previous estimates of a 2% de ...