It’s time once again for Earth Hour, an annual event in which thousands of cities, towns, homes, hotels and landmarks around the world turn off their lights for an hour, at 8:30 p.m. local time, to make a statement about climate change.

Even if you’re not into the “lights out” movement, the idea that places as diverse as casinos on the Las Vegas Strip, the John Hancock Tower in Boston and the National Cathedral in Washington, D.C. will turn off the lights for an hour is quite impressive.

Some airports will be participating in Earth Hour as well.

For example, at Los Angeles International Airport (LAX), the 100-foot-tall LAX Gateway pylons at the airport’s entrance will light solid green one hour before Earth Hour on Saturday, March 31. Then, during Earth Hour, from 8:30 to 9:30 p.m., the pylons will be turned off.

And in Chicago, O’Hare and Midway Airports will participate in Earth Hour by turning off non-essential lighting in the terminals, airport facilities and office buildings.

If you know of other airports planning to dim the lights on Saturday, please use the comments section to let us know.

Thanks for visiting Stuck at the Airport. Subscribe to get daily travel tidbits. And follow me on Twitter at @hbaskas and Instagram.