According to the new measures, announced by the main industry lobby, Airlines for America (A4A) on Monday, US airlines may prevent anyone not wearing a mask from boarding.
However, if passengers remove their mask after boarding the plane, flight attendants have limited competence on the matter. Exceptions will be foreseen, including when people are eating or drinking.
In its statement, A4A said the carriers with the stricter policy include Alaska Airlines, American Airlines, Delta Air Lines, Hawaiian Airlines, JetBlue Airways, Southwest Airlines and United Airlines.
Each carrier will decide the repercussions for passengers who fail to comply with the new rules.
The measures are expected to remain in place throughout the Coronavirus pandemic. Since the pandemic hit the global aviation industry, the US government has not mandated any airline safety requirements, despite calls from unions and industry.