The A340-600 would be flying its 350 passengers as long and for a lower cost than the 20 seats larger Boeing 747-400, the then-largest long-haul Boeing jet. It would have worked hadn’t Boeing upgraded the 777-300 to the 777-300ER and surpassed the spec. How much better did that make the 777-300ER when it arrived in 2004?
The A340-600 could take almost as many passengers as the Boeing 747-400 and fly these to the same distance.
In addition, it loaded more LD3 cargo containers and burned only three-quarters of the fuel of a 747-400.
But the advantage of the A340-600 was shortlived. Only two years later Boeing responded with the 777-300ER which bettered the Airbus on almost all accounts.