airline pilot and aviation specialist. and sean pernicky here. accident investigator for flight 5191. gentlemen, welcome to you. let's begin with this transcript that we have finally obtained. you've looked at it. officials say nothing sinister. do you agree? >> hi, brooke. i agree entirely. it's the transcript of a very normal flight up until the time of the last transmission. there has been some discussion about some nonstandard verbiage by whoever was speaking. >> no big deal? >> no big deal. flying in that part of the country, it's the rare individual that says everything the way it's supposed to be said. and flying here in the u.s., the same thing happens. you try to shoot for a standard, but the right things to say on the radio. it's very unusual to find a person that does that exactly right. >> do you agree?