Aer Lingus has resumed flights from Irish airports to London Heathrow following this morning's anti-terror operation in Britain.

The airline says it hopes to have its schedule back to normal as soon as possible. 

More than 30 flights between Ireland and Britain were disrupted today as a result of the security alert in the UK and thousands of passengers had their travel plans disrupted. 

Many flights to the UK were cancelled while hand baggage restrictions were introduced on some transatlantic flights. 

Flights to Heathrow from Dublin, Cork and Shannon airports were cancelled as well as most flights from Ireland to Stansted following this morning's anti-terror operation in Britain.

Transatlantic passengers are being advised of certain hand baggage restrictions, with Aer Lingus banning hand luggage for passengers who are flying to Britain and then getting connecting flights onto another destination. 

Mobile phones and keys are included in the ban. 

All transatlantic passengers are being told they cannot bring any liquids onto planes, which means they cannot buy duty-free drinks and perfume. 

Cullen: No increased security risk at Irish airports

The Minister for Transport, Martin Cullen, said there was no increased security risk at Irish airports, and that his department is continuing to monitor the situation closely. 

Minister for Agriculture and Food, Mary Coughlan, has said Ireland is not facing a security threat.

She was speaking following a meeting of the National Security Committee, which briefed the Government and the Taoiseach on security issues.

Aer Lingus has set up a telephone service for passengers affected by this morning's disruption. The number is 0818 365 044.

Ryanair is advising all passengers who have booked flights to the UK or other destinations that they may change to an alternative flight free of charge, subject to availability.

Flight delays of one to two hours were reported at Belfast City, Belfast International and Derry City airports.

Flight Information & Contact Details:

British Airports Authority:

Heathrow Airport: Tel: +44 (0)870 000 0123

Gatwick Airport: 
Tel: +44 (0)870 000 2468

Stansted Airport: Tel: +44 (0)870 000 0303

Manchester Airport: Tel: +44 (0)161 489 3000

Northern Ireland:

Belfast International Airport Tel: +44 (0)28 9448 4848

George Best Belfast City Airport Tel: +44 (0)28 9093 9093

Derry City Airport Tel: +44 (0)28 7181 0784

Dublin Airport: Dublin Airport is warning of long delays.

Aer Lingus Emergency Number: Tel: 0818 365 044

Cork Airport: Tel: 021 4313131

Shannon Airport: Tel: 061 712000

Ireland West Airport, Knock: Tel: 094 9368100