Dr. Anthony Fauci, the top U.S. infectious disease expert, said Monday the U.S. should consider a vaccination mandate for domestic air travel, signaling a potential embrace of an idea the Biden administration has previously eschewed, as COVID-19 cases spike.
Fauci, President Joe Biden's chief science adviser on the pandemic response, said such a mandate might drive up the nation's lagging vaccination rate as well as confer stronger protection on flights, for which federal regulations require all those aged 2 and older to wear a mask.
"When you make vaccination a requirement, that's another incentive to get more people vaccinated," Fauci told MSNBC. "If you want to do that with domestic flights, I think that's something that seriously should be considered."
The Biden administration has thus far balked at imposing a vaccination requirement for domestic air travel. Two officials said Biden's science advisers have yet to make a formal recommendation for such a requirement to the president.
The officials, who spoke on condition of anonymity to discuss internal deliberations, said a vaccine mandate on planes could trigger a host of logistical and legal concerns.
The U.S. currently mandates that most foreign nationals traveling to the U.S. be fully vaccinated against the coronavirus, though citizens and permanent residents only need to show proof of a negative test taken within a day of boarding.
Federal rules don't require people travelling by air within the U.S. to show a negative test. Hawaii requires travelers to test or show proof of vaccination to avoid a mandatory quarantine.
Biden did not respond to questions on whether he was considering implementing a domestic air travel vaccination requirement, but he told reporters that the subject was discussed on a call with the nation's governors Monday morning.
"They asked Dr. Fauci some more questions about everything from whether or not he thought he was going to move to test at home — I mean, on air flights and that kind of thing," Biden said of the call before departing the White House for his home in Rehoboth Beach, Delaware.
Earlier this year the White House explored a domestic vaccination requirement for flights, or one requiring either vaccination or proof of negative test. But officials have not been eager to mandate vaccination for domestic air travel because they expected it to face immediate legal challenges, mitigating its potential effectiveness as a tool to drive up vaccinations.
Pressed last week on why Biden had not mandated vaccinations for domestic air travel, White House press secretary Jen Psaki told MSNBC that "we know that masking can be, is, very effective on airplanes."
"We also know that putting in place that additional restriction might delay flights, might have additional implications," she added. "We would do it, though, if the health impact was overwhelming. So we rely always on the advice of our health and medical experts. That isn't a step at this point that they had determined we need to take."
Data from the Centers for Disease Control and Prevention show more than 241 million Americans, about 77% of the eligible population aged 5 and over, have received at least one shot of a COVID-19 vaccine. Officials believe, though, that there is some over-count in the figures due to record-keeping errors in the administration of booster shots.
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Since the summer, the Biden administration has embraced various vaccination requirements as a way to get unvaccinated Americans to roll up their sleeves. It has instituted requirements that federal workers, federal contractors, and those who work in health care get their shots, and that employers with 100 or more employees institute vaccination-or-testing requirements for their workers.
Those vaccination requirements have been mired in legal wrangling, with the Supreme Court set to hear arguments Jan. 7 in cases seeking to overturn them.
