Southwest cuts sales outlook as 737 MAX grounding hits US carriers

Southwest Airlines trimmed its revenue estimate Wednesday, citing flight cancellations due to the Boeing 737 MAX grounding among key factors dragging on earnings.Southwest, which focuses primarily on travel within the United States, cancelled 9,400 flights in the first quarter, with the Boeing grounding accounting for about a third of that number, the company said in a securities filing.The disclosure highlighted the hit from the Boeing debacle to US airlines following a Federal Aviation Adminis