Foursquare on Monday announced a big milestone: the Hartsfield-Jackson Atlanta International Airport (ATL) has become the first location on the mobile social network to pass 1,000,000 check-ins. The number is a big one for the service, and it’s completely unsurprising that it’s an airport to get the title.

Foursquare of course notes ATL is one of the most highly-trafficked airports in the world. Along with checking in at ATL, airport-goers have shared their experiences by leaving over 2,000 tips behind for future travelers, including regarding suggestions regarding where to find power outlets, a quiet place for a nap, or the shortest taxi line.

According to the company’s data, Monday is the airport’s biggest day for travel, and Terminal B sees the most traffic on average. Here’s how the check-ins look like in heatmap form:

Atlanta Airport map Foursquares first location to log 1 million check ins is Atlantas Hartsfield Jackson airport

Foursquare passed the 3 billion check-in mark back in November 2012. That means ATL makes up less than 0.03 percent of all the service’s check-ins, which is still quite sizeable if you remember it’s just one place.

The concept of checking-in was a very hard one for many to wrap their head around in the early days of Foursquare. Yet people love to announce on Facebook and Twitter when they arrive at an airport, implying that they are travelling somewhere (usually for vacation), and Foursquare quickly leveraged this trend.

It therefore is both expected and rather fitting that an airport was the first to hit the 1 million mark. We wouldn’t be surprised if the next couple of places to hit the same milestone on Foursquare were also all airports. In fact, we’re more interested to see what the first non-airport location to hit 1 million check-ins will be. Hopefully it won’t be a coffee shop.

See also – After nearly 3 billion check-ins, Foursquare reveals its top places across the US for 2012 and Foursquare now includes the business’s Twitter handle when you tweet your check-in from that location

Image credit: Vjeran Lisjak