which deals with emergency reporting:
DM57 (remaining fuel) OF FUEL REMAINING AND (remaining souls) SOULS ON BOARD
Note - N response attribute
Report indicating fuel remaining (time) and number of persons on board.
(remaining fuel) ENDURANCE AND (persons on board) PERSONS ON BOARD
While for VFR and IFR flight plans 'persons' is used:
91.153 VFR flight plan: Information required.
(a) Information required. Unless otherwise authorized by ATC, each person filing a VFR flight plan shall include in it the following information:
(8) The number of persons in the aircraft, except where that information is otherwise readily available to the FAA.
91.169 IFR flight plan: Information required.
(1) Information required under §91.153 (a) of this part;