Escalating row over Europe's new emissions tax
Sixteen countries including the United States and India are meeting in Washington at the end of July to decide their next step in the increasingly bitter row with Europe over new emissions trading taxes for airlines.
Carriers in China and India are refusing to provide required data to Brussels so their liabilities can be calculated.
Many are pressing for a compromise to be bartered by the UN's international civil aviation organisation.
Nigel Cassidy has been hearing from carriers at the Farnborough airshow.