21st....or the numbers of missions includes multiple aircraft taskings on the same mission (which would then be sorties) or as stats can be manipulated....multiple stop flights where folks drop off and some are picked up....when the aircraft load is counted towards Pax carried and Cargo carried for a daily Sum....the numbers can grow exponentially. I have seen that game played at several places both military and civilian.
Example.....a Bell 212 with an eleven pax seating arrangement departs from the home heliport with eleven passengers aboard....arrives back at the heliport after making five stops and the load sheet shows Sixty-Six passengers carried. Yet only Twenty-Two humans ever rode as passengers.