Don't Hang writes:
how many rubbers could they realistically get in before catastrophe strikes?
This is off-topic and strictly for your education, Hang.
Here in the colonies, "rubber" is the slang term for condom.
I can now dry my office chair, thank you for the chuckle, and get back to work!
Oops!
Intriguingly, a double entendre that works equally for male and lady flight crew.