I’m currently getting a winds aloft weather data error on my iPhone 6 (iOS 11.0.3). It’s been occurring for me since about 2:20pm eastern time.
I’ve tried restarting Infinite Flight. My custom DNS server shows no blocked requests, so it’s probably something on your side. My internet is fully working at this time.
It is however very nice to fly at 36k ft with 3 kt crosswinds, so maybe keep this low in the priority list of things to fix ;)