Comment by smokey_the_bear

In the US, I usually show up about an hour before. A little less if I'm traveling alone, but holiday are a disaster at American airports.

Once, I showed up two hours before a flight a few days after Christmas. I had a lapchild, so we needed to check in with a person and not use the kiosks.

We stood in line for 90 minutes, then stood in the security line for 30 minutes and missed our flight. They couldn't rebook my family for a week. We rented a minivan and drove 1800 miles, without our luggage.