If you’ve flown in the last 15 years, you probably know about T.S.A. PreCheck, the program intended to speed vetted travelers through dedicated airport security lanes: You don’t have to remove your shoes or belt and can keep liquids and electronics in carry-ons.

Over time, the Transportation Security Administration program, which costs under $80 for five years, has become less exclusive as its membership numbers have soared to more than 22 million. Meanwhile, the standard security line has begun to resemble the PreCheck line, with the recently announced end of the shoe removal rule; new lanes for families and veterans at certain airports; and the rollout of more advanced imaging technology.

So how much time does PreCheck actually save travelers at some of the busiest U.S. airports? We analyzed publicly available data from some major airports, including the three in the New York area.

At these airports — Kennedy, LaGuardia and Newark — PreCheck saves travelers five to 10 minutes on average, according to our analysis. But this will depend on the terminal you’re flying out of and the time of day you’re departing. Sometimes you may save over 30 minutes, sometimes none at all.

At some other major airports, the average time saved appears to be lower than in New York.

It’s too early to say how the shoe rule change will affect PreCheck’s value. But at the very least, PreCheck is a relatively inexpensive insurance policy. It can make a big difference if you find yourself flying when lines are longer than usual. We have data on specific New York-area terminals below.