...Nothing quite makes a mans balls drop quicker than impending death. Way better than that liquid courage bullshit: alcohol. I can see it now. All it would take is faulty landing gear to scream out, "You're absolutely beautiful and I wanna go down on you!" to her.
Then I'd immediately follow that with, "...and if we survive this I'd love to explore other similar options with you!" Then as everyone proceeded into some balance between the shock over what they've just heard and the overwhelming terror of impending death, I'd start laughing hysterically, surprised that no one else making like-wise confessions.
I would only hope that in this distressed and emotional state she'd fulfill my request. With me going down on her in some terrifying, frantic, beautifully awkward oblivion.