In 2026, the "2-hour rule" is still the standard recommendation for domestic flights, but it is increasingly viewed as a minimum rather than a safe buffer. For domestic travel, arriving 2 hours early allows for potential traffic delays, baggage drop-off, and fluctuating security wait times. For international flights, the standard has shifted to 3 hours, largely due to more complex document checks (like ETIAS for Europe) and longer immigration queues. However, your actual "pro" arrival time should be adjusted based on the airport's size and the time of day; for instance, a Tuesday morning at a small regional airport might only require 60 minutes, whereas a Friday afternoon at a massive hub like Atlanta (ATL) or London Heathrow (LHR) may require even more than 3 hours. With the widespread use of digital boarding passes and biometrics in 2026, those with "TSA PreCheck" or "Clear" can often shave 30-40 minutes off their wait, but it is always better to spend an extra hour in the terminal lounge than to risk missing a flight due to an unexpected "choke point."