I arrived at the airport about 4.5 hours before my flight was schedule to take off!!! My company arranged the traveling and if I changed the times and missed my flight for some reason, I would have to pay my own way to fly. It was not worth it to me.
When I got the airport, after getting through security very quickly, I had about 3 hours to wait until boarding. I did what any person would do if they cannot sit still. I walked for about 2 hours around the airport. It was too bad, I walk in an out a few stores, but I felt good stretching my legs before such a long flight.
How do you get a little exercise in before a long flight?