Originally Posted by
RealFish
If only T5 was big enough!
I believe it's not that it is "big enough", or not, but that there is a Planning Restriction on T5 (but not the other older terminals) that it can only handle a certain number of passengers per year. 33 million seems to ring a bell, others may have the detail. This is why when flights are introduced into T5, others get moved over to T3. It's also why flights parked on the remote stands between T5 and T3 cannot all just be served by coaching from T5.