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.
Domestic - 90 minutes before your flight International - 120 minutes before your flight BUT..if you're traveling on a heavy day (ie Wed, Thrus night, Friday, Saturday) during high capacity times (mid-day thru early evening) then show up at leastr 120 min early for domestic, and 160 minutes for international flights.