Europe to JNB...

[wannabe7]

Hi,
Recently went to JNB with Virgin and noted that all the flights from Europe fly over night arriving 1st thing in the morning and are then all towed to remote stands untill the eve when they all go back to Europe.
Virgin, BA, SAA, Lufthansa etc all seemed to do the same thing.

Is there any particular reason why all the airlines chose to keep their A/C on the ground for over 12 hrs?

Thanks!