investigations began after the cabin panel of a 737 max 9 jet blew off during an alaska airlines flight last week. it's the second major safety scandal to put the 737 max in spotlight; the first involved the deaths of 346 people in two crashes in ethiopia and indonesia. addressing employees at a factory in washington — where the planes are assembled — dave calhoun said boeing would approach the issue with complete transparency. we are going to approach this, number one, acknowledging our mistake. we are going to approach it with 100% and complete transparency every step of the way. we are going to work with the ntsb who is investigating the accident itself to find out what the cause is. we have a long experience with this group. they are as good as it gets. i trust every step they will take and they will get to a conclusion. i'm joined by professor graham