Why do travelers need to factor in time for security checks at O'Hare?

Travelers need to factor in time for security checks at O'Hare due to the unpredictability of check-in lines. Security checks at large airports like O'Hare can vary greatly in the time they take, depending on several factors such as the time of day, the number of travelers, and whether there are any increased security measures in place.

During peak travel times, such as holidays or busy weekends, the lines for security can be significantly longer, requiring travelers to allow extra time. Furthermore, even when check-in lines seem manageable, unexpected changes such as technical difficulties or additional screening requirements can create delays. By planning for the possibility of waiting at security, travelers can ensure a more stress-free experience and avoid missing their flights.

In contrast, quick security checks may occur occasionally, but they should not be counted on due to the variability in traveler volume and security procedures. Security is a strict requirement and not optional, as all travelers must go through this process to ensure the safety of everyone at the airport.