Most passengers on an aircraft
Who
El Al Boeing 747
What
1088 people
Where
Ethiopia (Addis Ababa)
When
The greatest number of passengers ever carried by a commercial airliner is 1,088, by an El Al Boeing 747 during Operation Solomon, which involved the evacuation of Ethiopian Jews from Addis Ababa, Ethiopia, and started on 24 May 1991. This figure included two babies born on the flight. The operation to evacuate the Ethiopian Jews continued non-stop for 36 hours involving a total of 34 El Al jumbo jets and Hercules C-130s - with seats removed to accommodate the maximum number of passengers.

For more detailed information see Feature from 1995 edition (also attached below).

Feature from the 1995 edition (p. 126): An astounding record was set on 24 May 1991 when 1086 Ethiopian Jews were evacuated to Israel in one plane. This was more than double the normal capacity of a passenger jumbo jet, and not surprisingly, never before had so many people flown in a commercial airliner. Two babies were born en route bringing the total who landed in Israel to 1088. The flight was just one of 40 which were put on to evacuate a total of 14,200 Jews to their promised land from Addis Ababa, the besieged capital of Ethiopia, all in the space of 24 hours. The exercise, codenamed ‘Operation Solomon’, had been planned over several weeks with US diplomatic assistance, and President Bush personally helped with the request to the Ethiopian government for permission to be granted to carry out the airlift. The Jewish Agency for Israel and El Al, the Israeli national airline, helped co-ordinate the whole operation.