The Institute of Medicine released two seminal reports in 1999 and 2001.The first report, To Err is Human: Building a Safer Health System released in 1999 received enormous publicity and focused attention on the issues of medical error and patient safety.
The general rule of thumb is that one is supposed to arrive. 1  2 hours early for a domestic flight and. 2  3 for an international flight.
Add another 30 to 60 minutes for an international departure leaving at a peak time. It's better to arrive at the gate early and catch up on your reading, than to arrive on time and miss your flight (most carriers secure the plane doors five minutes before departure time!).