[Regulator]

I’d still like to know what the hell they were doing all that time. This story stinks

Yep. 78 minutes is a long, long time to supposedly be engrossed in your laptops and not hear a call, especially repeated calls.

The CVR track will tell the story. And they know that.

[Elle Bee]

the CVR tape only records the last 30 minutes

Just a guess here ... something was recorded in the last 30 minutes they didn't want for prosperity so they flew on for enough time to record over the last 30 minutes

.

[Grammy]

What is a CVR track?