Earlier quoted context omitted.
I meant to say "cruise", if that makes more sense.
If it is any consolation, I knew what you meant. Otherwise, you'd probably have said something like glide and the glide ratio of the big planes isn't very good. Out of curiosity, I just checked for the A380 and the best guess is 15:1, so it does glide better than I expected, but still not that far. Google tells me that it'd glide ~130 miles if it had a starting altitude of 45,000'. That's better than I expected.
It's been done in real life for the A330. 120 km from a starting altitude of 10 km to Lajes Airbase in the Azores. https://en.wikipedia.org/wiki/Air_Transat_Flight_236