Do I really need to arrive 3 hours early for an international flight?

Do I really need to arrive 3 hours early for an international flight? I haven't flown internationally since I was a child, but I will be going to Scotland from the U.S. tomorrow. I recently traveled domestically, and I got through security pretty quickly on my first flight. Then I waited for a little over an hour. My home airport is pretty small. I plan to only have a carry on. However, my research and an email fr...

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