Why MAS operate A332 on all its KUL
flights? Competition. South East Asian pasengers are extremely particular on which aircraft they will be flying on, despite you are only spending 35 minutes in the air. SIA operates 5 of its 8 daily services to KUL
using B772 as well. But later this year, all of SIA's shuttle run to KUL
will be changed to B772 as well.
So we have MAS operating 49 weekly A332 flights, SIA operating 45 weekly B772 flights and JAL operating 7 weekly B767/B777/MD-11 flights between KUL
or vice versa. Plus you have Sri Lankan operating 5 times weekly using A330 and Air India operating twice weekly using A310 with traffic rights between KUL
(for Sri Lankan) and KUL
for Air India. Air Mauritius operates twice weekly KUL
using A340/B767 and Royal Nepal Airlines operate twice weekly on SIN
using B757 without traffic rights. That's a lot of flights for such a short hop, and all of them (with the exception of Nepal Air) are operated with a wide-body!