>>19066197 (lb)
Plane last bread was using callsign EXEC1F.
This is the callsign used by a plane carrying the First Family, that is the spouse or children of the President.
It is clearly identified as military in the capture.
>EXEC1F is the callsign when the president is on a civil flight, according to the information I sourced.
I suggest you find better sauce.
https://www.faa.gov/air_traffic/publications/atpubs/atc_html/chap2_section_3.html
EXEC1 is for President using a civil plane, this is extremely rare occurrence.
EXEC1F is for first family.
Plane was using EXEC1F hence first family.
Plane was clearly marked as military on ADSb.