Delta Air Lines, American Airlines, United Airlines, Alaska Airlines and Frontier Airlines will require passengers to wear face coverings because of the coronavirus pandemic. Delta’s, United’s and Alaska’s requirements begin May 4, Frontier’s on May 8 and American’s on May 11. The carriers will have masks available but are recommending that passengers bring their own. The airlines had previously announced face covering requirements for flight attendants, and earlier this week JetBlue and Lufthansa announced mask requirements for passengers.  Leaders of the House Committee on Transportation and Infrastructure recently sent a letter to the industry group Airlines4America requesting that carriers mandate face coverings. Kurt Stache, senior vice president of customer experience for American, said passengers should bring their own masks or face coverings that fit them comfortably but added, “American is working to procure face masks and hand sanitizer as a supplement.” In its announcement, Alaska said “the temporary policy will be reevaluated periodically as guidance evolves.”