According to reports, if successful the legal challenge would force the
government to repay ?2bn.
Gordon Brown doubled the duty in December’s pre-Budget report, taking the
levy on short-haul flights to ?10 from 1 February and on long-haul to ?40.
The FTO claims that under international laws included in European legislation
in 2004 the government is not entitled to impose charges on aircraft solely for
the right of transit over, or flying in or out of Britain from another country.
The Treasury though has defended the legality of the tax.