Tyber,

Some of the 6.5 to 7.5 mm one use fire rescue rope (My last was 7.0 mm) is in the 4000 to 5000 pound catagory. Although small diameter standard rope might work in an emergency, I would not carry it for that use. I have carried 7 mm for stabilizing personnel on a steep trail, especially when carrying a litter. It would not be my choice if I were on vertical rock.

I don't know where you got your information on commercial air lines, but they are FAR from a 1:1 safety factor.

Respectfully,

Jerry