Travel chaos grips UK's airports

Passengers are being asked to be patient when facing delays
BAA advice
Stringent security measures have been put in place at UK airports, causing passengers severe delays, following a police anti-terror operation.
All short-haul inbound flights to Heathrow airport have been cancelled. Some flights in and out of Gatwick have been suspended.
German carrier Lufthansa and the Spanish airline Iberia have cancelled flights to the UK.
Security has been increased at Channel ports and the Eurotunnel terminal.
Fifteen flights have been delayed at Edinburgh Airport. Most of those flights were scheduled to fly to London.
Air France said it had cancelled five flights from Heathrow to Paris.
BAA has said that at Heathrow all short-haul inbound aircraft have been cancelled. Inbound long-haul flights continue to operate but with severe delays.
For outbound flights at Heathrow, check-in across all four terminals is severely affected and there are lengthy delays. Some airlines have cancelled outbound short-haul flights.
Virgin West Coast has said it will accept any London to Manchester air tickets dated with today's date on its trains.
Passenger concern
The BBC News website's Krishan Ramakrishnan at Heathrow said travellers at the airport were not as worried by the security operation as by the inconvenience of being allowed to take just passports and medicines on the plane.

All cabin baggage must be processed as hold baggage and carried in the hold of passenger aircraft departing UK airports
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Courteney Dane, who is travelling back to Australia, said: "I'm worried about the cost and the fact I've got a 24 hour flight with nothing to read. I'm not really worried about the security, it's just a nuisance."
Our reporter said there was an enormous queue to get into the Terminal Four building.
He said many travellers were working out ways to travel to Europe by alternative methods, such as Eurostar.
He also described Terminal Three as a "sea of people", as a huge queue built to get in to the departure lounge.
Charlotte Demant, a make up artist, has been in Ghana for two weeks and was on her way home to Denmark.
She said: "I can understand why they are worried about security but the airline has not been helpful.
"We should have at least been given something to eat and drink and money to phone home. I'm going to end up spending the night here in the cold airport."
Increased security
Scotland's airports are busy but passengers are still being advised to turn up even though there may be long queues for check-in.
There were extra security checks at Glasgow airport and Edinburgh, Aberdeen, Prestwick and Dundee were experiencing delays.
At Glasgow airport, Michelle Standaloft, from Rothesay, said: "Everyone's quite calm now, but when you come and you see the police and everything, you are a bit concerned."
She added: "We know it's for our own benefit, in fact it's probably the safest day to fly."
Most people have been polite but some have been angry
Warren Tarling, Gatwick airport
At a glance: disruption
West Midlands disruption
Bristol airport delays
Disruption at Gatwick
Manchester airport has said there are delays on all flights of between one and three hours.
The only flights from the airport cancelled were those BMI and BA flights destined for Heathrow.
Stansted airport is open, with flights arriving and departing but passengers are experiencing waits of up to three hours to get through checks.
Over 2,000 passengers clutching their plastic bags snake around the terminal queuing to pass through customs.
Toni and Ray Haslam were on their way for a short break to Limoges but had heard their flight was one of many that have been cancelled.
"At least we can go back home, and it was just a pleasure trip. It's really bad for those who really have to be at their destination," Mrs Haslam said.
Extra police have been drafted in to many UK airports.
At Gatwick, airport worker Warren Tarling said he had never seen the airport so busy.
"There's thousands upon thousands of people. All flights out of the airport have been delayed," he said.
"Most people have been polite but some have been angry. Generally people have been understanding because of the nature of the problem."

Many holidays have been ruined by the delays
Transport Secretary Douglas Alexander said all airports and airlines operating into and out of the UK would be on a heightened state of security.
"Maximum security unfortunately will involve immediate and severe disruptions for passengers with significant delays likely at all UK airports," he said.
"What these changes mean in practice is that all hand baggage will now have to be checked in with only a small number of essential items allowed through search controls.
"Exceptions will be in place for those travelling with infants and for prescription medicines."
Passengers are being asked to check in most items of baggage, apart from wallets and purses, identity and travel documents, prescription medicines, spectacles and sunglasses and keys.
Those travelling with children will be allowed items essential for caring for them on the flight.
Passengers wanting detailed information are being advised to contact the airline they were due to travel with. Information would also be available on the Home Office, the Department for Transport and Foreign Office websites.