When all is said and done tonight, it's likely we'll have seen the busiest Labor Day travel weekend in years.

AAA estimates 34.7 million Americans planned trips over the long weekend, the highest number since 2008.

Spokeswoman Heather Hunter says more people are vacationing because of the improving economy, but also because of the calendar.

"Historically when Labor Day weekend begins in August Americans have shown a higher tendency to travel when the holiday is earlier on the calendar," Hunter said.

Hunter says AAA estimates 29.7 million people chose cars to travel 50 miles or more from their homes. Nearly three million were expected to fly.