As a rule of thumb, a 1% improvement in energy efficiency knocks more than $1 million off an airliner’s fuel bill over its lifetime of roughly 20 years.
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The average flight in European airspace is 50 km (31 miles) longer than it need be - largely due to primitive air-traffic management (ATM) systems.
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Every minute a plane spends at the terminal costs the airline $30.
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Airlines are responsible for 2-3% of the world’s carbon emissions.
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The average London bus, according to the UK’s Department for Environment, Food and Rural Affairs, contains only 17 passengers.
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