The US has a transit mask mandate.

US travellers will need to wear masks on flights, trains and buses through May 3.

The US Federal airline mask mandate, which is unpopular among both passengers and crew, was extended for a further 15 days.

The spread of omicron is monitored by the CDC.

In order to assess the potential impact the rise of cases has on severe disease, including hospitalizations and deaths, and health care system capacity, the CDC Order

The fifth federal mask mandate extension was explained by the case increase.

They are trying to give them more time to assess the impact of the cases on the healthcare system.

At the end of that two weeks, they can decide what's next.

The administration continues to force unnecessary and conflicting mask mandates on the public, according to Republican Senator Roger Wicker.

In the days leading up to the previous mandate's expiration, airline executives and politicians piled on the pressure for the Biden administration to let the Covid-19 mask rules expire.

US airlines led the call to end the mandate, with chief executives of seven carriers including American Airlines, United Airlines and Delta Air Lines telling President Joe Biden in a letter last month that it was no longer aligned with the realities of the current epidemiological environment.

Ed Bastian, the CEO of Delta, said that it was time to let the masks go.