Three major U.S. airlines to require face coverings on domestic flights

United Airlines, Delta Air Lines Inc. and American Airlines Group Inc. joined JetBlue Airways Corp. on Thursday to require face coverings on U.S. flights.

All three of the largest four U.S. airlines, along with the smaller Frontier Airlines, announced they will require facial coverings starting in May.

Delta and United's new rules start May 4, while Frontier's start May 8 and American's begin May 11. Young children are exempted from the requirements.