https://www.mercurynews.com/2020/05/01/many-u-s-airlines-will-require-passengers-to-wear-face-masks-onboard/

Airline passengers will soon be required to wear face masks when flying to help combat the COVID-19 pandemic.

American Airlines, Delta Air Lines and United Airlines all said Thursday they would join the growing list of U.S. airlines that will require people to wear face coverings while onboard flights. JetBlue earlier this week became the first U.S. airline to announce it would require passenger face masks.