[KSagal]

SegNerd is right, I was wrong in saying it was the Airlines, it is the FAA, which all US airlines and those doing business in the US follow.

I believe it is the same for all airlines in the US, including cargo. To ship cargo, I have and many others as well, ship via ground.

I have also heard that airlines doing business outside of the United States have different rules, however. I suspect that a flight within Europe would have different rules, as an example. But a plane from Europe that comes to the United States, or leaves from here to go back would have to follow FAA rules.

My information is dated, and may not be current. I have not heard of a change, but there may have been one... I would check with more knowledgeable people than me before making any major decisions on this topic.