This is why, as a UK based traveller, I aim to get to the airport for international flights so that I can check in when checkin opens 3 hours before the flight.

This is why, as a UK based traveller, I aim to get to the airport for international flights so that I can check in when checkin opens 3 hours before the flight. At least I'm usually sat in a comfortable lounge for the extra time, and can get a few things done, or just relax and read.