Southwest Airlines Flight 3809 on its way from Minneapolis-St. Paul airport to Denver, had to divert and make an emergency landing at Sioux City airport in Iowa, at about 2:40 p.m. on June 29.
The decision to divert and make an emergency landing was made after the pilot noticed a power warning light flashing in the cockpit.
The Boeing 737, with 143 passengers and 5 crew members aboard, then landed without incident after remaining in the air for about 90 minutes.
Southwest spokeswoman Michelle Agnew said that the pilot adopted a cautious route although the situation was not that dire.
Sioux City airport operations manager John Backer said that the passengers were provided a replacement plane to resume the journey after waiting for three hours in the lounge.