helicopter itself, as well as the background of all of the above. >> reporter: investigators say they hope to have a preliminary report in as little as five days though they caution answers may take much, much longer. lana zak, abc news, back to you, john and marci. >> thanks. new developments in the search for flight 370. officials in thailand, malaysia's neighbor, say its radar showed an unidentified plane flying toward the strait west of thailand, after the transponder signal was lost. malaysian investigators adding to 12 days of frustration and confusion changed their mind again about key details tuesday leading to criticism ranging from incompetence to a cover-up. >> it leads to a lot of speculation. not just within the public and media, but also within people involved in the investigation and in the search. >> u.s. officials tell abc news they remain focused on a deliberate act, mainly because someone programmed the autopilot