United Airlines and American Airlines will begin to provide masks to passengers beginning in early May.
United said masks will be available for passengers on domestic and international flights but it won't be compulsory to wear them.
"We are not mandating that passengers wear a mask however we strongly encourage travelers follow CDC guidance to wear a face covering when social distancing is difficult," United Airlines spokesperson, Nicole Carriere said. "By providing the masks, we’re making it that much easier for them to do so."
American Airlines said it would provide masks "as supplies allow."
"In May, we will begin to distribute sanitizing wipes or gel and face masks to passengers, as supplies allow. Our flight attendants will be required to wear face masks on all flights, beginning May 1," the airline said in a statement.
On Monday, Jet Blue announced it will require all passengers to wear a face covering during travel starting on May 4.