It has been almost a month since the Ethiopian Airlines plane crash in March. Sources say Ethiopian authorities will deliver a preliminary probe report today.

The crash that killed 157 people is the second such disaster involving a brand-new Boeing 737 MAX jet in less than five months. More than 300 of the MAX model aircraft have been grounded worldwide.

Boeing said it would launch a software update for the grounded planes in the coming weeks. CGTN's Girum Chala has spoken exclusively with Ethiopian Airlines Group CEO, Tewolde Gebremariam, on the investigation.

TEWOLDE GEBREMARIAM CEO, ETHIOPIAN AIRLINES "You know there is a very clear similarity with the Lion Air accident because number one, it's the same airplane model, brand new in our case less than five months in service. I think it's similar with Lion Air plane also. This plane had two fatal accidents in a span of five months. So this by itself tells you a lot about the airplane. On the other hand, the duration of the flights is also almost similar, our flight was six minutes, very short flight. So although I have not seen the preliminary report which I told you will be released very soon perhaps in this week, but I have seen some media reports which are not correct. For all I know our pilots have worked very hard to save the situation but it was beyond their control."

GIRUM CHALA CGTN CORRESPONDENT "You have grounded four out of the five Boeing 737 Max 8 planes, one of them has crashed unfortunately. And then as we know more than 300 of them are grounded across the world. In your case the grounding of the 4 Max 8 planes, what is the financial consequences that we are talking about here?"

TEWOLDE GEBREMARIAM CEO, ETHIOPIAN AIRLINES "If we are talking about financial consequences, it's huge because this tragic accident is unique in many ways. You know there are multiple judiciary processes going on in Chicago in the U.S., criminal investigation and so on. So it is going to be huge financial implication but I think we should not focus on financial implications rather we should focus on human flight safety. So I'm very happy that we have decided to ground the plane on the same day."