Bloomberg | Bloomberg | Getty Images
Southwest Airlines Co. planes stand on the tarmac at San Francisco International Airport (SFO) in San Francisco, California, U.S., on Friday, Jan. 19, 2018. Southwest Airlines Co. is scheduled to release earnings on January 25. Photographer: David Paul Morris/Bloomberg via Getty Images
Southwest Airlines told its mechanics on Friday that it is experiencing an “operational emergency” due to an unusually high number of grounded jets — and demanded they show up for work or risk termination, according to a company memo issued on Friday and seen by CNBC.