A baby with milk in a transparent plastic bag at Edinburgh Airport

Security measures were brought in for air passengers across the UK, causing delays and cancellations.

BAA Scotland, which runs Edinburgh, Glasgow and Aberdeen airports, said there were 10 cancellations. Passengers were asked to check with their airline.

Inverness Airport said there were no cancellations or delays.

Extra security measures will remain in place for several more days while the UK's security level remains at "critical".

There are still some delays and a handful of cancellations but passengers should find that most flights are operating and departing on time Donald Morrison BAA Scotland

The alert followed an alleged plot to blow up US-bound passenger jets that authorities claimed was thwarted on Thursday, a few days before it was due to be carried out.

Thanking passengers for their patience, BAA Scotland spokesman Donald Morrison said: "The airports are now effectively back to normal.

"There are still some delays and a handful of cancellations but passengers should find that most flights are operating and departing on time."

At Glasgow Airport there were no major delays although there have been five flight cancellations.

Travellers were told there were still some delays with checking in

Restrictions on entry to Glasgow Airport were lifted on Friday for friends and family who are now able to enter the terminal building.

At Edinburgh Airport, there were four cancellations and most flights were operating normally despite some delays on Flybe services.

There were no reports of any delays at Aberdeen Airport, where just one flight was cancelled.

But passengers still face a hand luggage ban for all but the most essential items and individual searches, leading to long check-in queues.

Security restrictions remain in force and all hand luggage must be checked in Donald Morrison BAA Scotland UK baggage restrictions

Serious delays and cancellations still dogged London airports, especially on transatlantic flights to the US.

Mr Morrison said: "Security restrictions remain in force and all hand luggage must be checked in."

Despite two cancellations, Easyjet resumed a full flying programme.

The budget airline's Scottish routes and flights to Luton, Stansted and Gatwick were all shelved on Thursday and Friday but are now operating again.

The airline is opening its check-in desks three hours before departure in a bid to help passengers beat long queues.

BMI, which operates regional flights from Glasgow, Edinburgh, Inverness and Aberdeen, is also operating a normal service.