Its a precautionary measure, when window shutters are open passengers can look outside and can see any unforeseen event which can be reported to the crew which improves the chances of saving life. Some countries its a law while in some cases it has been enforced by airlines only...
What is the science involved with the study, design, and manufacture of flight-capable machines, and the techniques of operating aircraft?
An aircraft flying at 40,000 feet can be heard to break the sound barrier when it achieves a speed of how many miles per hour?
