Atlanta – The world's busiest airport experienced an unprecedented power outage that seemed to defy all of the precautions put in place to prevent it, and during the 11-hour ordeal, internet users noted that only one mysterious plane was allowed to leave the airport.

Over 1,000 flights were canceled when the Hartsfield-Jackson Atlanta International Airport lost power around 1 p.m. on Sunday, causing a chaotic situation as thousands of travelers were affected. While Georgia Power claimed that the power outage was the result of a small fire, it left many wondering why the generators and backup systems available to prevent such an emergency were not utilized.

All flights were grounded during the power outage—or at least that is what the public was told. According to the air traffic website, FlightRadar24, there was at least one flight that landed at the airport right before the power went out and then left in the middle of the ordeal. A Boeing 747, with the tail number 4X-ICB, is a cargo plane that landed in Atlanta from Mexico City at 1 p.m. on Sunday.

Despite the fact that Atlanta officials claim the next flight did not leave the airport until 12:26 a.m. on Monday, after the power was restored, the records from 4X-ICB show that it departed from Atlanta at 6:27 p.m. on Sunday—right in the middle of the outage.

The plane's next destination was Liege, Belgium, and while it could be played off as just another cargo plane, the fact that it was the only plane allowed to leave Atlanta's airport is just one notable factor.

The plane is operated by CAL Cargo Airlines, a Jewish airline company headquartered in Tel Aviv, Israel. Its fleet consists of just three Boeing 747's and it claims to transport a variety of cargo, including "controlled pharmaceutical and healthcare products, live animals, dangerous goods, oversize and overweight cargo."