Leaning Your Seat Back on a Plane

This survey will take roughly 2 minutes to complete.
    It is acceptable to lean your seat back in economy class on a plane. 
    It is acceptable to ask the person in front of you not to lean their seat back on a plane. 
    It is acceptable to purchase a device, like a Knee Defender, to stop the person in front of you from leaning back on a plane. 
    If you ask if you can lean your seat back, and the person says no, it is acceptable to do it anyway. 
    If the person in front of you asks if they can lean their seat back, it is acceptable to say no. 
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    If it is a long flight
    If it is an overnight flight
    If you are elderly
    If you are tall
    If the person behind you is tall
    If it is a turbulent flight
    If you have children
    If you are in business or first class as opposed to economy class
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