As in Cards?
On the BCBS Flight (pre-1066 Flt) the kirkee school would start immediately after met brief. As crews were called forward new players would take their place.
As the day progressed the first aircraft would return about 6 hours later with the school still in progress. Eventually the 'day school' (non-flying crews) would 'stack' and the returning crews would take over until pub rise. About 6 o'clock the school would STACK the cards.
Howzat?