The request for a return to usual security measures was made by the Irish no-frills airline to Douglas Alexander, the Transport Secretary.
Security at airports was heightened last week after an alleged bomb plot was uncovered to blow up passenger jets bound from Britain to the United States using explosives smuggled aboard in hand luggage.
Ryanair said that if security was restored to “normal” International Air Transport Association (IATA) levels within the next seven days then the airline would “not make any claim for compensation which it is entitled to under the provision of section 93 of the Transport Act 2000”.
But the Department of Transport shrugged off the threat, saying that it had no intention of changing security levels in the next week.
“The security regime in place at UK airports is necessary because of the level of security threat and is kept under constant review,” said a spokesman. “We have no intention of compromising security levels nor do we anticipate changing our requirements in the next seven days.”