I thought this was interesting. The three associated countries of the US, Palau, Micronesia, and the Marshall Islands all appear to use US traffic control. It's obvious when you think about it, they're US associated states, but I don't think many people have put much thought to it. It doesn't seem like there's anything particularly interesting or special to it, it's more of just a "huh, neat, i never really thought of that" thing.
Here's a few examples of Palau.
https://www.google.com/maps/@7.3617835,134.5036187,3a,75y,263.66h,81.74t/data=!3m8!1e1!3m6!1sAF1QipMPtSmQxOINToUVVD-GYzXnLk8RINH6uZOkHMUo!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipMPtSmQxOINToUVVD-GYzXnLk8RINH6uZOkHMUo%3Dw203-h100-k-no-pi-8.887297-ya0.50214756-ro2.2511592-fo100!7i5376!8i2688 (https://www.google.com/maps/@7.3617835,134.5036187,3a,75y,263.66h,81.74t/data=!3m8!1e1!3m6!1sAF1QipMPtSmQxOINToUVVD-GYzXnLk8RINH6uZOkHMUo!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipMPtSmQxOINToUVVD-GYzXnLk8RINH6uZOkHMUo%3Dw203-h100-k-no-pi-8.887297-ya0.50214756-ro2.2511592-fo100!7i5376!8i2688)
https://www.google.com/maps/@7.3655982,134.510973,3a,75y,181.81h,89.65t/data=!3m8!1e1!3m6!1sAF1QipO4WxAHboq0Zhknu2RFZURPeHsYsToQsp8TZd4v!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipO4WxAHboq0Zhknu2RFZURPeHsYsToQsp8TZd4v%3Dw203-h100-k-no-pi15.59517-ya176.61899-ro4.668436-fo100!7i5376!8i2688 (https://www.google.com/maps/@7.3655982,134.510973,3a,75y,181.81h,89.65t/data=!3m8!1e1!3m6!1sAF1QipO4WxAHboq0Zhknu2RFZURPeHsYsToQsp8TZd4v!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipO4WxAHboq0Zhknu2RFZURPeHsYsToQsp8TZd4v%3Dw203-h100-k-no-pi15.59517-ya176.61899-ro4.668436-fo100!7i5376!8i2688)
https://www.google.com/maps/@7.344534,134.4822539,3a,75y,92.9h,88.51t/data=!3m8!1e1!3m6!1sAF1QipNK9K0QhDs30D8K_KfHoOlDJiQRoMRCHsIve0wo!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipNK9K0QhDs30D8K_KfHoOlDJiQRoMRCHsIve0wo%3Dw203-h100-k-no-pi-10.146139-ya7.1771126-ro-0.51544696-fo100!7i5376!8i2688 (https://www.google.com/maps/@7.344534,134.4822539,3a,75y,92.9h,88.51t/data=!3m8!1e1!3m6!1sAF1QipNK9K0QhDs30D8K_KfHoOlDJiQRoMRCHsIve0wo!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipNK9K0QhDs30D8K_KfHoOlDJiQRoMRCHsIve0wo%3Dw203-h100-k-no-pi-10.146139-ya7.1771126-ro-0.51544696-fo100!7i5376!8i2688)
Micronesia:
https://www.google.com/maps/place/Weno,+Chuuk,+Federated+States+of+Micronesia/@7.4416695,151.8394646,3a,75y,240.6h,88.75t/data=!3m8!1e1!3m6!1sAF1QipM8yC7Xkg91iIPI5vjCx7W0LKUBs35qYRy21jr7!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipM8yC7Xkg91iIPI5vjCx7W0LKUBs35qYRy21jr7%3Dw203-h100-k-no-pi-0-ya108.04961-ro-0-fo100!7i10240!8i3682!4m5!3m4!1s0x6667a652c1960ea1:0x5e6fea973714ba7b!8m2!3d7.4563671!4d151.8496974 (https://www.google.com/maps/place/Weno,+Chuuk,+Federated+States+of+Micronesia/@7.4416695,151.8394646,3a,75y,240.6h,88.75t/data=!3m8!1e1!3m6!1sAF1QipM8yC7Xkg91iIPI5vjCx7W0LKUBs35qYRy21jr7!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipM8yC7Xkg91iIPI5vjCx7W0LKUBs35qYRy21jr7%3Dw203-h100-k-no-pi-0-ya108.04961-ro-0-fo100!7i10240!8i3682!4m5!3m4!1s0x6667a652c1960ea1:0x5e6fea973714ba7b!8m2!3d7.4563671!4d151.8496974)
If you're interested, there's more. However, most of the photo spheres are on Palau.
A lot of those island nations had (and some still have) heavy U.S. military presence since World War II, so that's not really a surprise.