The crash of a Boeing plane that killed 189 people in Indonesia is spiraling into a $22 billion feud between the aircraft maker and one of Asia\u2019s most influential aviation bosses. In a rare public dispute between the planemaker and one of its biggest customers, the head of PT Lion Mentari Airlines has threatened to cancel an order for billions of dollars worth of jets because of what he says is Boeing\u2019s unfair reaction to the crash. The man standing up to the US aviation giant is Rusdi Kirana, Lion Air\u2019s owner, and while he was little known to the public outside Southeast Asia before the crash, he\u2019s something of a legend in the industry. Eighteen years after he and his brother rented a Boeing 737-200 to start a service from Jakarta to Bali, Kirana, 55, has turned Lion Air into Indonesia\u2019s largest airline, with one of the biggest order books in the world. \u201cHe is, by virtue of the significance of Indonesia, right now probably the most important aviation figure in Southeast Asia,\u201d said Shukor Yusof, founder of aviation consultancy Endau Analytics in Kuala Lumpur. Kirana\u2019s undiminished appetite for expansion \u2014 he wants to start flights to destinations as far a field as London and Dubai \u2014 has made him a key customer for both Boeing and its European rival Airbus SE. Lion Air is the third-largest buyer of Boeing\u2019s updated 737. But seven weeks after a two-month-old 737 Max jet operated by the carrier plunged into waters off Jakarta, Kirana has started a public spat with the planemaker. Lion Air is drafting documents to scrap its $22 billion dollars of orders with Boeing because, Kirana says, the manufacturer unfairly implicated his airline in the disaster. \u201cI was in a tough situation and they decided to beat me up,\u201d Kirana said in an interview in Jakarta, referring to Boeing\u2019s response to Indonesia\u2019s preliminary report into the accident. \u201cThey have been behaving unethically, they have been acting immorally in this relationship, so we just go our separate ways.\u201d Boeing wouldn\u2019t comment on the discussions with Kirana, but said in a statement that \u201cLion Air is a valued customer and we are supporting them through this difficult time.\u201d The company said it is \u201ctaking every measure to fully understand all aspects of this accident, and are working closely with the investigating team and all regulatory authorities involved.\u201d The dispute revolves around Indonesia\u2019s worst air disaster in two decades. Moments after takeoff on October 29, the pilots on Lion Air Flight 610 battled to control their 737 Max as faulty data from a sensor repeatedly forced the aircraft to tilt its nose down, according to the preliminary report, which included evidence for the plane\u2019s flight data recorder, retrieved by divers. The plane slammed into the Java Sea minutes after leaving Jakarta, killing everyone on board. The report by Indonesia\u2019s National Transportation Safety Committee last month didn\u2019t find a cause for the crash. But it showed that a malfunctioning sensor wasn\u2019t repaired before the fatal flight \u2014 even though it failed on the plane\u2019s previous trip, and it criticized Lion Air\u2019s safety culture. The plane\u2019s cockpit voice recorder has yet to be found.