The president said Democrats were "all 'giddy' about our magnificent American Flag potentially being at 'half mast' during my Inauguration."

Video from an observation camera at the nearby Kennedy Center showed two sets of lights consistent with aircraft appearing to join in a fireball.

In a proclamation issued Dec. 29, Biden ordered flags across the U.S. to be flown at half-staff for 3 days "in honor and tribute to the memory of President James Earl Carter Jr. and as an expression of public sorrow."

Flags have flown at half-staff for nearly 30 days following former president Jimmy Carter's death. Here is when flags return to full-staff.