Flights into and out of Belfast and Londonderry have been among those hit by delays and cancellations today due to a major security alert at Heathrow. In particular, flights to and from the London airports have been affected, and passengers are being made to check-in their hand-luggage (including ladies' handbags) which will be flown in the hold. The Washington Post reports that the crackdown is in response to a specific terrorist threat to blow up planes crossing the Atlantic from Britain to America and the BBC reports there were plans to commit "mass murder on an unimaginable scale", blowing up 9 trans-atlantic flights.

Flight Information
Belfast International Airport have an announcement on their web site, as do Belfast City (George Best) Airport. City of Derry Airport don't have a specific announcement but it may be worth checking their arrivals/departures pages.

The major airlines serving the province FlyBe, easyJet, British Airways, British Midland and Ryanair have announcements on their website with passenger advice.