As well as having to undergo more stringent checks, passengers are also being limited to one piece of carry-on hand luggage.

BBC: Airport security measures

Her hand luggage was X-rayed along with her coat and camera bag, while she walked through a scanner.

BBC: reporter Colette Hume boards plane with aerosol can

At the airport security search, the plastic bag will need to be removed from the hand luggage and X-rayed separately.

BBC: A transparent bag containing toiletries

Travellers should also consider printing out boarding passes ahead of time to speed up the check-in process, and should remember the rules about packing liquids and electronics in carry-on and hand luggage.

BBC: Navigating the London 2012 exodus

It adds that holiday presents in hand luggage will need to be unwrapped -- but only for U.S.-bound flights.

CNN: STORY HIGHLIGHTS

All are following a similar line -- check before you fly, turn up early, expect tougher security and skimp on the hand luggage.

CNN: STORY HIGHLIGHTS