WASHINGTON (AP) — President Donald Trump’s plane, Air Force One, returned to Joint Base Andrews about an hour after departing for Switzerland on Tuesday evening.

White House press secretary Karoline Leavitt said the decision to return was made after takeoff when the crew aboard Air Force One identified “a minor electrical issue” and, out of an abundance of caution, decided to turn around.

A reporter on board said the lights in the press cabin of the aircraft went out briefly after takeoff, but no explanation was immediately offered. About half an hour into the flight reporters were told the plane would be turning around.

Trump boarded another aircraft, an Air Force C-32, a modified Boeing 757 normally used by the president for domestic trips to smaller airports, and continued on with his trip to the World Economic Forum in Davos shortly after midnight.

The two planes currently used as Air Force One have been flying for nearly four decades. Boeing has been working on replacements, but the program has faced a series of delays. The planes are heavily modified with survivability capabilities for the president for a range of contingencies, including radiation shielding and antimissile technology. They also include a variety of communications systems to allow the president to remain in contact with the military and issue orders from anywhere in the world.

Last year, the ruling family of Qatar gifted Trump a luxury Boeing 747-8 jumbo jet to be added into the Air Force One fleet, a move that faced great scrutiny. That plane is currently being retrofitted to meet security requirements.

Leavitt joked to reporters on Air Force One Tuesday night that a Qatari jet was sounding “much better” right now.

Last February, an Air Force plane carrying Secretary of State Marco Rubio to Germany had to return to Washington because of a mechanical issue. In October, a military plane carrying Defense Secretary Pete Hegseth had to make an emergency landing in United Kingdom due to a crack in the windshield.