Passengers are being warned of possible chaos at airports next month as some airlines seek to charge extra air tax for tickets bought months ago.
From 1 February the Air Passenger Duty will go up by between £5 and £40.
Most airlines raised fares as soon as Chancellor Gordon Brown announced the hike on 6 December.
But some are demanding further payment for tickets booked before the rise. Easyjet said the situation was "absolutely chaotic".
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