Update: On Tuesday, Britain, Australia, Germany, Singapore, Malaysia and Oman banned all Boeing 737 Max 8 planes from their airspaces. Read more live coverage on the crash and its aftermath here.

The Ethiopian Airlines plane crash that killed 157 people on Sunday has rattled travelers around the world. Just six months ago, the same model of airplane — a Boeing 737 Max 8, operated by Lion Air — crashed off Indonesia and killed all 189 onboard.

While the cause of Sunday’s tragedy remains undetermined, and the investigation into the Lion Air accident is ongoing, several circumstances of these two crashes are similar.

The 200-seat Boeing 737 Max 8 has been a popular plane since it came on the market in 2017, with more than 4,000 planes ordered within the first six months. The plane sold quickly based on features that passengers crave — a quieter cabin, more legroom — and bottom-line benefits to airlines, like fuel efficiencies. The plane’s entry into the market seemed like the rare win-win for both passengers and airlines. At the time of the Ethiopian Airlines crash, nearly 350 Boeing 737 Max 8s were in operation around the world, including in the United States, on routes across the country: Miami to Los Angeles, Houston to Denver, San Francisco to Portland.