Most airports with a curfew have a fine for late carriers rather than a requirement to divert. The fine covers things like extended control cover, plus any noise pollution breaches.
If the curfew was set for midnight, no airline would want to operate a service that was scheduled to arrive after 11pm (arguable EIR would need to go with 10pm), if it meant a diversion. Delays happen and as often as not one of the aircraft arriving back into Cork at night has a delay of around an hour on the flight.
Looking at today's flights, we already see 45 mins on the aircraft operating the BRS flight.
Last edited by 840; 26th Jul 2013 at 11:17.