I see the January summary report has now been issued.
I am surprised that while stack holding and taxi-in times have been fairly consistent in the three months that have been reported on, and average taxi-out time has been steady-ish, the average times for departure hold have been all over the place.
November average 10.26 mins
December 2.98 mins
January 7.53 mins
It doesn't appear to be related to easterlies/westerlies.
Anyone know any obvious causes ?
Is it a weather phenomenon ?
Or is there an ace who can get the movements running like clockwork in December but then goes on holiday ........?