Sir-The figures given in your data tables for large airliners (Flight International, 3-9 September) provide an interesting comparison between these two aircraft.
While the Aerospatiale/BAC Concorde can carry its maximum payload of 11,340kg a distance of 3,800km, the Boeing 747-400 carries 59,650kg for 13,180km - a performance 18 times better than that of the Concorde: and the aircraft only needs 65% more fuel to do this.
The figures show that on a kg/km basis, the Concorde uses 11 times more fuel than the 747 - not what environmentalists want to hear!
DAVIDMORRELL
London, UK
Source: Flight International
