The latest security measures imposed last week followed intelligence warnings that al Qaeda's chief bomb maker, Ibrahim Hassan al-Asiri, who is thought to be based in Yemen, had linked up with jihadists in Syria to pass on his skills.
Sir Malcolm Rifkind, the chairman of the Intelligence and Security Committee, who disclosed that he had been briefed in advance about the measures, said that he had been left in no doubt that they were necessary.
However, he said that he had encountered a level of complacency among some elements of the public which he found "seriously disturbing".
The head of the parliamentary committee which oversees the work of Britain's intelligence agencies has said that newly imposed airport security measures are "unavoidable".
Sir Malcolm Rifkind, the chairman of the Intelligence and Security Committee, said jihadi extremists were deploying "devilish technical skill" to create ever more sophisticated devices to evade existing security measures.
Writing in The Sunday Telegraph, he warned of the dangers of "complacency" among the public in the face of the failure of the terrorists to mount any successful mass casualty attack in the UK since the 7/7 bombings in London in 2005.
The case for a third runway at Heathrow will be submitted today by bosses of the west London airport. The three options which will be presented include:
1) A third runway to the north west of airport which would require part of the M25 being put in a tunnel and affect the villages of Longford and Harmondsworth.
Passenger capacity: 130m. Cost: £17bn. Starts: 2026. Demolishes: 950 homes
2) A third runway to the south west of the airport which starts over Wraysbury and King George VI reservoirs. A section of the M25 would need to be reconfigured and tunnelled and the village of Stanwell Moor flattened.
Passenger capacity: 130m. Cost: £18bn. Starts: 2029. Demolishes: 850 homes
3) A third runway close to Sipson, Harlington and Cranford Cross. It would be a shorter length with fewer planes, the cheapest and quickest option but also the noisiest and the highest number of homes would be affected.
Passenger capacity: 123m. Cost: £14bn. Starts: 2025. Demolishes: 2,700 homes
Thousands of air travellers face delays after air traffic control company Nats experienced "technical problems" at its Hampshire control centre.
The problem was at Nats' centre at Swanwick, near Southampton.
The company experienced some flight-affecting computer glitches when it first moved to the site about 10 years ago.
Air traffic control company Nats said it is restricting the number of aircraft flying across the south of England and those taking off from airports due to technical problems at its Swanwick control centre in Hampshire.
Jet2 chief executive Ian Doubtfire says an investigation will be carried out into what happened at Glasgow Airport today.
Passengers who were aboard this morning's cancelled flight to Alicante will be offered another flight at 3pm today.
Passenger Jean Walker said some people had to jump from the aircraft wing to the ground.
She said two women had to jump from the aircraft's wing because there was no escape chute available to her:
The Scottish Ambulance Service said it was treating four passengers for chest and hip injuries.
Strathclyde Fire and Rescue said it sent three appliances to the scene.
Glasgow Airport expect the runway to remain closed for at least another hour following the evacuation of a Jet2 flight this morning.
So far 12 flights have been unable to take off from Glasgow and a number of others have been diverted to Edinburgh.
There are reports of four people being treated for minor injuries, thought to have been sustained when using emergency chutes.