Though federal flag code dictates a 30-day mourning period after the death of a former president, not everyone is complying. Here's what we know.

Former President Jimmy Carter passed on Dec. 29. Flags were ordered to fly at half-staff for 30 days in federal observance of mourning. But Inauguration Day falls within that timeframe.

With the death of President Jimmy Carter at age 100, President Joe Biden has ordered flags to fly at half-mast.