But some expectations of fuel savings have been tempered with experience.
"It could mean $3 to $5 billion in fuel savings over 15 years."
Test flights confirmed a fuel saving and range increase of 4-5%.
An average fuel savings of 10% is possible by just cruising.
This is where most of the fuel savings are recognized.
They also reduce airport noise, he said, and will result in fuel savings of 40 percent.
A major selling point of these systems was fuel savings.
The aircraft will deliver fuel savings of up to 15%.
In tests, this has been shown to produce significant fuel savings.
A new survey shows that fuel savings of up to £250 per year are possible by shopping around.
