Have friends who are flying with Ryanair from ACE-DUB today and there flight was scheduled to arrive in Dublin at 18.40 but its now delayed until 04.20 tomorrow (according to DUB airport). ACE closes at midnight and they still have not left and the gate has said flight delayed since 12.00 today. Will the airport allow the flight to operate if its after midnight. Passengers are angry with such lack of infomation from FR. A number of passenger wanted to leave and come back but were not allowed. Flight was due to leave at 14.15. Still has not left.