THE EU Commission has been asked to probe allegations that airline companies ramp up prices if you check flights multiple times on the same computer.
Airlines and car rental agencies store details of consumer searches – meaning they know if someone is very interested in a particular route, and can increase prices, claimed Fine Gael MEP Jim Higgins.
Mr Higgins, who is a member of the European Parliament's Transport Committee said he will raise the matter with the European Parliament.
"A consumer that is interested in a particular flight and is keeping an eye on it by checking the price several times over a week or two, will often find that the flight increases," he said.
It could pay to double check from a different computer or phone before booking to make sure you are not being conned, he said.
Some commentators have claimed that it is an urban myth and prices simply rise over time according to demand.
Ryanair has flatly denied that it engages in the practice of storing customer searches and then increasing prices.
"Absolutely not," said spokesman Robin Kiely when asked if consumers would be quoted a different price from a different computer.
Mr Higgins has submitted a complaint to the EU Commission.