Anna (as the plane slowly loses altitude): "'I can show you the world,' they said... 'Shining, shimmering, splendid',
my a**!"
Sorry, I couldn't resist.
(It's been a hard day.)
If you want to "crash" your protagonist, there are many ways to do it, and it occurs to me that some are "fast" and some are "slow". The first thing I would decide (as the writer) is which do you want.
It'll affect the nature of the dialog a lot.
For instance, if the plane catches fire, you want it down and down *right now*; any piece of land in the middle of the ocean no matter how deserted-looking is going to be preferable to burning up. You aim for it and it's go-time, get 'er down, things happen fast, not much talking. On the other hand, if the engine fails but the plane is otherwise perfectly flyable, you try to stretch your glide as long as possible, to reach land or to radio for help or whatever, and there might be many long minutes where you can plan the "landing" and converse with your ship support, but also contemplate your fate. So (trying to think like a writer here!) you might want to pin down first what kind of mood or pacing you want this scene to have, then choose an appropriate emergency, and then tackle the exact dialog last.
Apologies if you've already figured all this out.
Also decide how many engines this plane has.
This sounds like such a fun project!