It could also improve fuel consumption by up to 20percentthroughgh reduced air drag.
When air pressure in the brake pipe is reduced, air is automatically admitted into the brake cylinder.
Some real-home trials found that sealing doors, windows and vents reduced air flow into the room by up to two-thirds.
The International Air Transport Association estimates that the world's airlines will lose around $11 billion in 2009 as the global recession sharply reduced air traffic.
The recovery project, which removed three miles of elevated highway as well, also substantially cut air pollution from cars along the corridor and reduced air temperatures.
One consequence, he said, will be reduced air service in some small and midsize markets as airlines opt for flights generating the most revenue.
Transport analysts in Japan attribute the losses to a combination of factors, including the needed repairs and weak economic conditions that have reduced air traffic.
With fewer bases scattered around Afghanistan, fewer troops on the ground and reduced air transportation, the military has less capacity to provide security for development teams.
In reply, Dan Bartlett, a spokesman for the Bush campaign, said the governor had actually reduced air and water pollution in Texas, and he ridiculed the Sierra Club's endorsement of Mr. Gore.
The guidelines stipulate improved insulation, windows designed to improve thermal performance, high efficiency heating and cooling systems that are properly sized for the home, and reduced air infiltration, among other things.
Reduced air pressure and oxygen levels do not appear to promote the formation of deadly blood clots on long commercial flights, an ailment sometimes called "economy-class syndrome," a new report said.
