(AP) — The National Transportation Safety Board is investigating why a pilot mistakenly landed a cargo-hauling jumbo jet at a small Kansas airport instead of the Air Force base a few miles away.

The agency opened the investigation Friday. NTSB spokesman Peter Knudson said in an email that the investigation would take about six to 12 months to complete.

The Boeing 747 was supposed to touch down Wednesday night at McConnell Air Force Base in Wichita. Instead, it landed at the smaller Col. James Jabara Airport.

Boeing owns the plane, but it’s operated by Atlas Air Worldwide Holdings. Atlas spokeswoman Bonnie Rodney said in an e-mail that the company is providing its full assistance to regulatory authorities.

The Federal Aviation Administration also is investigating the landing.