Solar Plane Halfway in Cross-Country Journey

A solar-powered plane that spent more than a week in North Texas has departed on the third leg of its cross-country trip.

The Solar Impulse took off early Monday from Dallas-Fort Worth International Airport bound for Lambert-St. Louis International Airport.

It's the first attempt by a solar plane capable of being airborne day and night without fuel to fly across the U.S.

The plane left Northern California on May 3 and landed the following day in Phoenix. The Solar Impulse departed Phoenix on May 22 and landed a day later in Texas.

The plane flies about 40 mph. The Texas to St. Louis leg is about 560 miles.

The rest of the schedule includes Dulles International Airport near Washington and New York's John F. Kennedy International Airport.