Sony Corp. says American cut short the executive's flight on Sunday and made an unplanned landing in Phoenix.
The plane with 179 passengers and a crew of six was scheduled to fly from Dallas to San Diego but stopped for what the FBI termed a security threat. American Airlines declined to comment on the threat.
A Twitter account called Lizard Squad tweeted to American Airlines that there might be explosives on the plane carrying John Smedley, the president of Sony Online Entertainment, which makes video games.
Sony spokesman Satoshi Nakajima said Monday that Smedley was on the plane.
San Diego airport spokeswoman Rebecca Bloomfield said that as the plane was being re-routed, the Transportation Security Administration told airport officials that the FBI was investigating a tweet about possible explosives on the plane.
After landing in Phoenix, the plane taxied to a remote area of the airport, where passengers exited and their bags were searched by police officers with dogs. American Airlines spokesman Casey Norton said the plane later resumed its flight to San Diego.
This isn't the first time someone has tweeted a threat about a plane or an airline. In April, police in the Netherlands arrested a 14-year-old girl who tweeted to American Airlines that she was part of al-Qaida and was "gonna do something really big bye."
When American replied six minutes later that it would turn over the matter to the FBI, the girl posted a series of panicked tweets and said she was just a girl.
Nakajima said the PlayStation Network's online services were unavailable from Sunday through Monday afternoon Tokyo time. While Lizard Squad tweeted that it was responsible for the hack that caused Sony's system outage, Nakajima said it remains unclear who compromised.
Sony said that no personal information was stolen as part of the breach. Hackers compromised the company's network — including the personal data of 77 million user accounts — in 2011. Since then, the network's security has been upgraded, the company said.