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But flying is one of the most efficient means of propulsion. If every passenger drove by car it would be much worse.
And the flight trails in the sky work against global warming by reflecting sunlight back into space.

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Look mate, you're wrong.  Just accept it and learn a new truth.  No need to get your knickers in a twist over it.

I gave you one source - Friends Of The Earth.  Oh so they're biased eh?  What against?  The aviation industry but not against automobiles!?!  Seriously, think about that one....  Especially as FotE generally get in INDEPENDENT experts for studies.  These people base their opinions on scientific FACT, not conjecture.

More sources?  Ok.  All the following quotes are from The Carbon Trust or Friends of the Earth and have benn ratified by the UK GOVERNMENT.

In total, the world's 16,000 commercial jet aircraft generate more than 600 million tonnes of carbon dioxide, the world's major greenhouse gas, per year.

Or what about this one: aviation generates nearly as much carbon dioxide as that from all human activities in Africa.

Here's one particularly relevant to you.....

A typical flight of under 500km, say from London to Amsterdam, will release 0.17 kg of carbon per passenger per kilometre compared with 0.14 kg/km by car, 0.052 kg/km for rail and 0.047 kg/km by ferry.

What makes the growth in air travel so concerning for ecologists is not just the nature of the emissions from aircraft that include carbon dioxide, water vapour, nitric oxide, nitrogen dioxide and sulphur dioxide, but the high altitude at which these gasses are being spewed into the atmosphere. At these heights, these chemicals have twice the effect on global warming than they have near ground.

The National Resources Defence Council say;

How significant is pollution from airports compared to cars?

One 747 arriving and departing from JFK airport in New York City produces as much smog as a car driven over 5,600 miles, and as much polluting nitrogen oxides as a car driven nearly 26,500 miles. While the government has effectively required cars to undergo emissions inspections (with resulting improvements in emissions and efficiency), airplanes have not received the same scrutiny. Meanwhile, air travel is increasing in popularity twice as fast as car travel and is projected to double within the next 20 years.

I'll find a lot more if you want.  Now wheres the expert that says:

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About the plane ride. Planes are about as polluting as cars, more polluting than buses and trains

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But flying is one of the most efficient means of propulsion. If every passenger drove by car it would be much worse.

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the flight trails in the sky work against global warming by reflecting sunlight back into space.

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