Airlines are tightening face mask rules three months after making masks mandatory on board.

Most major airlines have eliminated any medical exemptions to the rule, and several are cracking down on the types of face coverings allowed.

Read more: https://www.usatoday.com/story/travel/airline-news/2020/08/11/southwest-spirit-airlines-tighten-coronavirus-face-mask-rules/3308541001/