Five years ago, in June 2017, Apple introduced indoor airport maps—with support for 36 airports. Since then, this feature has been expanded to cover 122 airports worldwide.

So how many of these 122 airports are among the world’s busiest?

After five years, forty-four of the world’s sixty busiest airports (73%) have received Apple’s indoor airport maps:

As for the U.S., thirty-nine of the U.S.’s sixty busiest airports (65%) have received Apple’s indoor airport maps:

With the notable exception of San Francisco International Airport (the Bay Area’s primary airport), Apple has covered all of the U.S.’s 22 busiest airports.