However, no-frills carrier easyJet PLC said it had no plans to join in any attempt to sue BAA for compensation. Spokeswoman Samantha Day said BAA had dealt with the crisis as best as it could and the industry was better off discussing how to cope with future alerts.
BAA said it was working on the assumption that the current security regime would be maintained for the foreseeable future and it had begun working on bringing in additional staff and strengthening its security system.
The airport operator said it had added about 1,500 security guards to its security team since the Sept. 11, 2001, attacks, bringing the total to 6,000.
BAA owns and operates airports that handle 63 percent of travelers to and from Britain - a figure that rises to 86 percent in Scotland and to 92 percent in London.
Britain's competition watchdog is considering a detailed inquiry into the domestic airport market and whether BAA's dominance delivers the best value for air travelers.