How many passengers does the TSA screen on an average day?

How to get close to this number

Scale from the global figure. Worldwide airlines carry a few billion passenger journeys a year, and one large country accounts for a substantial share of them. A share of a few billion divided by 365 gives a daily figure in the low millions, which is where the answer sits.

The seasonality in the explanation is the useful detail: record days run well above three million around major holidays, while quiet periods fall below the average. Travel demand is one of the most seasonal statistics there is, so a daily average describes no actual day particularly well and the peaks are what capacity has to be built for.

The publication frequency is what makes this figure unusual. The agency publishes it daily, which turns a security operation into one of the fastest public indicators of national travel demand — economists and airlines watch it precisely because it arrives without the lag that most official statistics carry. Very few figures on this site are updated every twenty-four hours.