Southwest Airlines Co. /zigman2/quotes/201071949/composite LUV -0.36% will join other airlines in requiring passengers and customer-facing employees to wear face masks, starting May 11, amid safety concerns during the COVID-19 pandemic. The air carrier said it will provide a face covering to passengers who don't bring their own. The air carrier said starting May 2, it will reduce temporarily the total number of passengers seated on its planes, and boarding and deplaning procedures will be modified to maintain social distancing. Smaller groups of 10 people at a time will be allowed to board sequentially by boarding position, Southwest said. The company said it was suspending inflight beverage and snack service. Southwest's move to require face masks follows announcements by rivals, including American Airlines Group Inc. /zigman2/quotes/209207041/composite AAL +0.67% and Alaska Air Group Inc. /zigman2/quotes/200972303/composite ALK +0.44% .