Flags are flown in various DoD aircraft nearly every day for the purposes of presenting them for various occasions. When I was assigned to a unit in DC, we had flag requests to be flown all the time. Since we were an ANG unit, a member that retired from our unit would get a flag that was flown by a fighter, a USCG helo, and various installations involved with our mission. The flag was then presented at retirement. It is a common practice.