Thousands of air passengers are being slapped with extra taxes as they fly out of the UK as a "green" increase in Air Passenger Duty (APD) comes into force.
Chancellor Gordon Brown announced the controversial move to double APD in his pre-budget report.
And although airlines have already collected the tax rise from many passengers, others will turn up at airports to find they have to stump up an additional £10 for a short-haul route or up to £40 on a longer trip.
British Airways ...
Thousands of air passengers are being slapped with extra taxes as they fly out of the UK as a "green" increase in Air Passenger Duty (APD) comes into force.
Chancellor Gordon Brown announced the controversial move to double APD in his pre-budget report.
And although airlines have already collected the tax rise from many passengers, others will turn up at airports to find they have to stump up an additional £10 for a short-haul route or up to £40 on a longer trip.
British Airways decided to absorb the tax hike at an estimated cost of £11 million, meaning that passengers who booked before the announcement have not been asked for more.
But most other airlines have chosen instead to pass on the increase.
Travellers booked on some low cost carriers have seen the extra charge added to their credit card bills.
Others were told of the increase by email, with one airline warning those who failed to pay up in advance would not be allowed to travel.
However a legal expert said airlines may not be compelled to pay the tax rise to the Government.
A barrister commissioned by the Conservative Party said the Treasury could lack the authority to collect the extra cash because it has not been sanctioned by Parliament.
Adrian Jack, of Enterprise Chambers, also suggested that passengers might be within their rights to refuse airlines' demands to cough up the money in retrospect.
He said: "In principle they could refuse to pay the addition where they purchased their tickets prior to the Chancellor's announcement, because there would be no contractual obligation to pay any more."