Ceremonies are being held in Ethiopia and around the world today to mark one year since the crash of Ethiopian Airlines Flight 302, which killed all 157 people on board. A new House report released Friday finds that engineering errors, inadequate federal safety oversight and a “culture of concealment” were responsible for the crash, as well as Indonesia’s Lion Air crash in October 2018, which killed 189 people — both crashes on Boeing 737 MAX aircraft. Ethiopian aviation authorities also released a report this week blaming Boeing equipment and training for the crash.

In other aviation news, the trial of four people — three Russians and one Ukrainian — accused of downing Malaysia Airlines Flight 17 over eastern Ukraine in 2014 opened in the Netherlands Monday. The names of the 298 victims were read in court before proceedings began.