CNN is reporting the tickets linked to the stolen passports used by two passengers on board a missing Malaysian aircraft were purchased by an Iranian man in Thailand.
The US network says the tickets were bought by the man from a Thai travel agency and paid for in cash.
The man, who is said to be a regular customer of the travel company, reportedly called the agency and asked for two tickets for friends wanting to travel to Europe.
The two tickets had different final destinations - Frankfurt and Copenhagen.
A mother has described her frustration as she waits for answers on the fate of her missing son who is on board the missing Malaysia plane.
Malaysia's military believes a jetliner missing for almost four days turned and flew hundreds of kilometres to the west.
The wife of a passenger travelling on the missing Malaysia Airlines flight has spoken of her struggle to cope as she waits for news.