Nonstop Flight: How The Frigatebird Can Soar For Weeks Without Stopping : The Two-Way : NPR

Scientists have been attaching transmitters on the huge seagoing birds and are astonished by their ability to stay aloft.

Gliding flight - Wikipedia

Snowbirds won't take flight as investigators look into cause of crash

This bird species can fly for months at a time without landing

Good godwit! Bird flies 8,425 miles NON-STOP from Alaska to

Frigate birds fly nonstop for months

Rutan Voyager - Wikipedia

Gliding flight - Wikipedia

How Can Birds Sleep While They're Flying?

The World's Longest Non-Stop Flight