Obama aides argue that the cost estimates assumed by the McCain team make no allowance for savings most Americans would see as a result of reduced health care and energy expenses, and jobs created by investments in new environmentally friendly industries.

CNN: Economy takes center stage in bruising political ads

At the Farnborough International Air Show outside London last week, Lufthansa Technik AG and Israel Aerospace Industries Ltd. announced coming tests of one environmentally friendly taxi system.

WSJ: Honeywell Tests Autopilots for the Tarmac