The British government has rejected a demand from Ryanair to relax extra security measures at UK airports.
The Department of Transport in London said authorities had 'no intention' of changing the current arrangements because of the continuing terror threat.
Earlier, Ryanair threatened to sue the British government for loss of earnings as a result of new security measures.
Last week, 24 people were arrested in a British police operation against an alleged terrorist plot to blow up transatlantic aircraft.
The UK raised its terrorist alert level to 'critical' and heightened security restrictions at British airports, leading to numerous cancellations and long delays.
Ryanair is demanding that security at UK airports be restored to pre 9 August levels.
Speaking at a press conference in London this morning, Ryanair Chief Executive Michael O'Leary said failure to relax restrictions would hand a public relations victory to extremism.
Mr O'Leary claimed some of the current security measures were nonsensical and were sending the wrong signal to the public.
The Ryanair boss said that all airlines wanted a safe aviation system but that the current measures were an overreaction.
The low cost airline has now begun a seat sale which it says will restore consumer confidence in the airline industry.
