Britain is the first European country to begin executing a plan by the European Union to reduce emissions from aviation.
The UK lawsuit could be the first in a series of transcontinental legal battles as global industries face up to Europe's tougher rules on climate policy.
The EU estimates that one person flying from London to New York and back generates roughly the same emissions output as it takes to heat the average European home for a year.
On my way to the Copenhagen climate summit in December, I wrote about the unusual mid-air experience of hearing the Air France pilot announce our flight's carbon footprint -- one signal of the transatlantic tensions to come.
The U.S. airline industry has adamantly opposed establishing emissions limits domestically, and this lawsuit against the UK shows the widening gap between how the U.S. and European industries are approaching carbon emissions reductions.
The UK's largest airline, British Airways, has said it will be able to voluntarily reduce its emissions to half that of 2005 levels over the next decade; and Virgin's Chairman, Richard Branson, has said he is willing to pay a carbon tax on his aviation business. He has also steered some $3 billion of company funds into researching non-fossil fuel alternatives and other greenhouse gas reduction measures.
With the EU upping the ante on emissions controls while the U.S. drags its feet in Congress on setting its own emissions targets, the UK lawsuit could be the first in a series of transcontinental legal battles as global industries face up to Europe's tougher rules on climate policy.