May 7 (UPI) -- The Air Force's X-37B space plane made an unexpected landing on Sunday and rattled Central Florida with a a sonic boom, officials confirmed.
The unmanned mini-shuttle, which lifted off from Cape Canaveral Air Force Station atop an Atlas V rocket on May 20, 2015, spent 718 days in orbit -- an endurance record.
It was the fourth space trip for the 29-foot-long, 11,000-pound craft, but the first time it has landed in Florida.
The Air Force's two X-37B reusable mini-shuttles both have completed two mostly classified missions, spending 2,085 days in low Earth orbit. The first mission launched in 2010.
"The landing of OTV-4 marks another success for the X-37B program and the nation," Lt. Col. Ron Fehlen, X-37B program manager said in a news release. "This mission once again set an on-orbit endurance record and marks the vehicle's first landing in the state of Florida."
The X-37B's return to Florida was not expected because its three previous flights ended at Vandenberg Air Force Base in California.
The Air Force said it plans to launch the fifth X-37B mission from Cape Canaveral later this year.
Videos show the X-37B's landing on a runway from two different angles.