Two passengers of the missing Malaysian Airlines flight with the passports of an Italian and an Austrian citizen appear to have bought their tickets together, reports CNN.
According to China's official e-ticket verification system Travelsky, the tickets were bought from China Southern Airlines in Thai baht.
Besides, the ticket numbers were found to be contiguous indicating that they were issued together.
Italy and Austria have said that none of their citizens were on board the plane.
Officials say that the passports of the Italian and Austrian whose names were on the passenger manifest were stolen in Southeast Asia in recent years.
The two tickets start in Kuala Lumpur, flying to Beijing, and then onward to Amsterdam. The Italian passport's ticket continues to Copenhagen, the Austrian's to Frankfurt.
Authorities are investigating the identities of some of those on board who have issues with their passports.
Malaysian military officials said the passenger jet might have changed the course and turned back toward Kuala Lumpur but the pilot give no signal to authorities regarding it.
On the other hand, a Chinese person whose passport number was among those listed for passengers aboard of the missing flight did not board the plane.
According to Xinhua news agency, the person was a resident of Fujian province in eastern China. The passenger has no departure record and is still in Fujian.
Moreover, the name listed by Malaysia Airlines for the passenger was different to that of the individual who held the passport with the number.
However, the owner said the passport had never been lost or stolen.
The matter was disclosed after it emerged that two people boarded the missing flight from Kuala Lumpur to Beijing, with stolen European passports.
