Watch Project Blue Book, Tuesdays at 10/9c! On April 25, 2007, the captain of a passenger plane observed two bright-yellow flat objects for more than 15 minutes. A pilot from a separate aircraft corroborated the story. The team takes to the skies to probe some of the largest UFO sightings ever recorded, in Season 2, Episode 10, "Giant UFOs". #UFOHunters Subscribe for more from UFO Hunters and other great HISTORY shows: po.st/SubscribeToHistory Find out more about this and other specials on our site: po.st/History_UFOHunters Check out exclusive HISTORY content: History Newsletter: po.st/HistoryNewsletter Website - po.st/HistoryWeb Facebook - po.st/HistoryFacebook Twitter - po.st/HistoryTwitter HISTORY®, now reaching more than 98 million homes, is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network's all-original programming slate features a roster of hit series, epic miniseries, and scripted event programming. Visit us at www.HISTORY.com for more info.