Heathrow Airport
On 10 August 2006, the airport caused changes in security, when a supposed al-Qaeda terrorist plot was uncovered. New security rules were put in force immediately, causing restrictions about carrying liquids on board flights. This caused longer queues and wait times at security. Restrictions included the prohibition of carry-on luggage (except essential items such as travel documents and medication) and all liquids – although this rule was later relaxed to allow the carrying on board of liquid medications and baby milk.