When asked how long the issue has been going on for and whether those affected by the error will receive compensation, an airport spokesman said: “The ‘Silver Zone Non-Flex’ pricing category is a new product for our customers.
“As explained, this product and lower pricing category does come with some restrictions when it comes to cancelling or amending a booking.
“We do offer regular promotional offers throughout the year. Any customers experiencing problems applying promotional codes should contact us directly.”
A spokesperson for the Advertising Standards Authority (ASA) said the “advertising rules are clear”.
They said: “Ads must not materially mislead people, or be likely to do so. In particular, price statements shouldn’t mislead by omission, undue emphasis or distortion.
“Whilst the ASA can’t comment on whether or not an ad has broken the rules without a formal investigation, we always encourage anyone who has a concern about an ad they’ve seen to get in touch.”