Question

You're flying in a plane and the seatbelt sign is turned off. You're in the _____

Answer 1

Stratosphere is the right answer.

As light is seen in the stratosphere, so as the cloud formation is rare in this zone. Though this zone also has complicated wind regularities, drastic storms don't befall there. Due, to this reason why the airline pilots prefer to operate in the stratosphere. The turning on or off the seat-belt depends on the pilot. If a pilot thinks that requirements are, or are expected to be, such that tourist move professes a threat, the combined seat belt symbol is illuminated. Precisely when those requirements are present is up to the pilots' responsibility.

Answer 2

You're flying in a plane and the seatbelt sign is turned off, You're in Stratosphere
This happen when you usually entered 16km in height. Up to this point, it would be safe to use wireless communication device.

hope this helps