Taxes on airlines planned by the French and Swedish governments have been criticised by the two countries' national carriers.
France is planning to impose a tax on airline tickets to help aid underdeveloped countries.
Sweden is proposing an environment tax of €10.50 (SEK100) on all flights from Swedish airports from next May.
The French tax has the backing of President Jacques Chirac but is opposed by airlines, many countries in Europe and also the USA.
If approved by the French Parliament, the tax would from next July add €1 to short haul economy class tickets and €4 to long haul economy class tickets.
For business and first class tickets, the tax would be €10 for short haul and €40 for long haul.
It is expected to raise about €210m a year for aid.
But the Association of European Airlines (AEA) said it was dismayed by the French decision to go ahead with the tax.
Ulrich Schulte-Strathaus, AEA secretary general, said: "This decision defies all reason. Our industry is struggling to recover from a period of sustained losses, to cope with a massive rise in the price of fuel and to invest in new technologies which will deliver environmental benefits.
"Now our business is threatened by a heavy-handed move to make our product more expensive for our customers."
What defied belief, he said, was the extent to which business travel was being targeted.
"Our calculations indicate that almost half the anticipated tax revenue will come from long-haul business travel," he said.
Jorgen Lindegaard, ceo of SAS, said the green tax could lead to a drop in revenue.
"My best bet is a drop of 5-6% in overall revenue for SAS Sweden if the tax is imposed. But it could be more or less," he said.
Mr Lindegaard said he had written to Sweden's political parties saying the tax would damage the domestic market.
There would be little environmental benefit as the tax would lead to planes flying with empty seats.