Boingo Wireless and Google Play announced a new partnership today to bring free Wi-Fi to more than 4,000 hotspots across the country, including 15 airports (Chicago O’Hare, New York’s JFK, Seattle-Tacoma, etc.) as well subways, restaurants, hotels and shopping malls.

The offering is part of Boingo’s new Cloud Nine Media platform, an advertising platform which it acquired last month.

VentureBeat notes that the owners of iPhones, iPads and Windows phones will be “left out in the cold” as part of the promotion. We asked Boingo for comment about that, and here’s what a spokeswoman said:

The Google Play Wi-Fi sponsorship is offering Android phone and tablet users, as well as Windows and Macintosh users, free Wi-Fi at more than 4,000 locations nationwide. Google Play is a content platform designed for Android devices, and this Wi-Fi sponsorship is focused on reaching Android tablet and phone users as well as Windows and Macintosh laptop users. For users of other devices, the service terms will vary by location. In locations where the Wi-Fi is offered free by the venue, it will continue to be free for all users, but they won’t receive the Google Play sponsorship message.

The new promotion runs through the end of September.

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