AS Wiggy points out Singapore is a good example with . I was on a BA74 one evening returning to UK and Captain came on to explain that while there was no aircraft in front of us he was going to have to hold position for a few minutes until a large slip passed the far end of the runway.. Presumably while it is passing there is no longer a 'clearway?' a the end of the runway but an obstacle which has performance compliance issues and of course going non stop and full SIN-LHR he was going to need all the concrete available