TOKYO — Carlos Ghosn was aided in his escape from Japan by an American security consultant who accompanied him on the flight out of the country, a person familiar with the matter said, while a Turkish charter jet company said on Friday that its planes were used illegally to pull off the plan.

The Japanese news media also reported on Friday that surveillance camera footage showed the former auto industry mogul leaving his Tokyo home by himself on Sunday, a day before he turned up in Beirut, Lebanon.

With the new details, a clearer — if still imperfect — picture is emerging of how Mr. Ghosn, Japan’s most prominent criminal defendant, managed to evade authorities. The American consultant, a former United States Green Beret named Michael Taylor, was introduced to Mr. Ghosn by Lebanese intermediaries months ago, said the person, who asked not to be identified to discuss a sensitive issue.

Turkish media outlets have reported that Mr. Taylor and another American were the only people listed as passengers on a manifest for the flight that carried Mr. Ghosn from Japan to Turkey. On Friday, MNG Jet, an aircraft charter company, said one of its employees had falsified records to remove Mr. Ghosn’s name from the official documentation for two flights.