Reason being, the pavement classification number (PCN) of the runways and apron at Soekarno-Hatta Airport do not meet the required level of strength, which is typically needed for the operation of a full capacity, heavy duty commercial airline, such as the B 777-300ER.
Garuda Indonesia President & CEO Emirsyah Satar said that to operate at "full capacity" serving direct flights between Jakarta - London (non-stop) and carrying 314 passengers (8 first class, 38 business class, 268 economy class) and a cargo of 30 tons (maximum take-off weight), the B 777-300ER requires a PCN of 132 tons. Soekarno-Hatta's aging runway is already 28 years old and nearing "fatigue" with a pavement classification number/PCN of only 120 tons.
To enable Garuda Indonesia to still make the flight to London, there would have to be a "restricted take-off weight" of 329,365 kg, which would mean a reduction in the number of passengers by 39 people and a loss of the ability to carry cargo. Garuda Indonesia would also be unable to fly directly to London. Consequently, the implementation of this flight with these conditions in this competitive world of air travel would have a serious effect on the operational and business requirements of this route.
Due to this unexpected delay, Garuda Indonesia will begin the direct service from Jakarta to London in May 2014. Garuda will initially fly non-stop between Jakarta - London five times a week, departing from Jakarta at 00:55 LT, arriving at London (Gatwick) at 08.30 LT, and departing from London at 10.00 LT and arriving in Jakarta at 06:15 LT the next day.