Today on "World News with Charles Gibson":

Vote 2008:
Sen. John McCain campaigns in the battleground state of Ohio today with new running mate Sarah Palin, while his opponent, Sen. Barack Obama, addresses education at town hall meeting in Dayton. Our political team will have the latest.

Airports Losing Service:
By the end of the year, there will be 9 percent fewer flights than a year ago, which will amount to nearly 2,500 fewer commercial flights a day. The cutbacks will be devastating, particularly for passengers who rely on smaller airports to accommodate their travels. ABC's Lisa Stark reports.

And on our "World News webcast", along with our top headlines:

Big Bang Part 2:
Some of the world's top scientists are making their final preparations before launching one of the longest and most expensive projects ever attempted. These scientists hope to re-create the Big Bang -- and discover some of the mysteries of the universe along the way. ABC's Nick Watt reports.