More than 40 countries including the US, which had been one of the last holdouts, have grounded the 737 Max 8. Boeing\u2019s newest version of its best-selling airliner ever was supposed to boost its fortunes for years to come. Instead, it has turned into the company\u2019s biggest headache, with more than 40 countries including the US, which had been one of the last holdouts grounding the 737 Max 8 after a second fatal crash proved one too many. On Wednesday, the US Federal Aviation Administration (FAA) issued an emergency order keeping the planes on the tarmac after refusing to do so in the days immediately following the crash of a Max 8 operated by Ethiopian Airlines that left 157 people dead. The agency said what made the difference was new, enhanced satellite tracking data and physical evidence on the ground that linked the Ethiopian jet\u2019s movements to those of an Indonesian Lion Air flight that plunged into the Java Sea in October and killed 189 people. \u201cThat evidence aligns the Ethiopian flight closer to Lion Air, what we know happened to Lion Air,\u201d said Daniel Elwell, acting FAA administrator. Officials at Lion Air have said sensors on their plane produced erroneous information on its last four flights, triggering an automatic nose-down command that the pilots were unable to overcome on its final voyage. On Wednesday, global air traffic surveillance company Aireon, Boeing and the US National Transportation Safety Board were able to enhance the initial data and make it more precise \u201cto create a description of the flight that made it similar enough to Lion Air\u201d, Elwell said. While early satellite tracking data showed similarities between the Ethiopian jet\u2019s flight path and Lion Air, Elwell said the FAA was sceptical of the low-resolution images. The data showed movements that weren\u2019t consistent with how airplanes fly, Elwell added. The French air accident investigation authority, known by its French acronym BEA, said on Thursday that it will handle the analysis of the black boxes retrieved from the crash site. A BEA official told that they have already arrived in France but gave no time frame on how long the analysis could take. The BEA has experience with global air crashes, and its expertise is often sought whenever an Airbus plane crashes because the manufacturer is based in France. Since debuting in 2017, Boeing has delivered more than 350 of the Max in several versions that vary by size. Dozens of airlines around the world have embraced the plane for its fuel efficiency and utility for short and medium-haul flights.