Why you need to arrive early for international flights?

How early do you get to the airport now? Do you show up before takeoff by an hour? Consider two hours. There's a chance that's no longer enough time. Most airlines and airports continue to be overbooked and understaffed, which has changed the temporal dynamics of when you arrive at the airport and when you may fly. Why do International flights require early arrival? At least this summer, it is no longer wise to be at the airport two hours before your domestic flight. 

The TSA is understaffed, which causes longer and slower security waits. Some airlines even seal the gates 25 minutes beforehand to leave on schedule. Airlines are also having trouble staying on schedule. Arriving three hours early is the best advice. Even if you have a pre-printed boarding pass, you should avoid going through security and waiting for your flight to be called. Check-in for the flight as soon as you arrive at the airport. When aeroplanes are full, people who are considered no-shows are quickly replaced by standbys.