Originally Posted by
WHBM
This is correct for scheduling but in practice any delayed late departures or very late arrivals are able to be handled, and the balance is maintained by bringing in one or more of those due before 0600 in just after 0600. Because the limit is a global one across a season rather than a fixed amount per day this can be done when convenient. So you do get the odd 4 hours late 0200 arrival.
It's rarely, if ever, necessary to displace morning arrivals as a result of delayed late-night flights.
In summer there is always sufficient unused movement quota to accommodate them, in fact it's not unknown to see some flights with an STA after 0600 that are ahead of schedule being allowed to land before 6.
In winter, while actual movements are always over the season quota limit, there is provision to carry over some unused quota from the previous summer, which is normally sufficient.
And of course during periods of prolonged disruption, flights aren't counted against the night quota at all.