US drug regulators have approved Pfizer booster vaccines for people over 65 if they had their last shot at least six months ago.
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The Food and Drug Administration (FDA) has also authorised adults at higher risk of severe illness and who work in front-line jobs to get the booster jab.
It means tens of millions of Americans are now eligible for their third shot.
However the boosters still need approval from the Centers for Disease Control and Prevention (CDC).
Independent panels from the CDC are holding meetings on Wednesday and Thursday, and are expected to endorse the move quickly, US media reports.
The panels' decisions will include recommendations on who qualifies as high risk, and which frontline workers should be eligible.
For its part, the FDA says "health care workers, teachers and day care staff, grocery workers and those in homeless shelters or prisons" should be on that list, acting FDA commissioner Janet Woodcock said in a statement.
The FDA move is a victory for President Joe Biden, who had promised that booster vaccines would be available from this month as long as they received approval from the FDA and CDC.
For now, the decision only applies to Americans who have been vaccinated with the Pfizer-BioNTech jab. Millions of Americans who received Moderna and Johnson & Johnson jabs will have to keep waiting for further booster approval.