I flew SFO-ATL on Friday and the captive portal was screwed up -- typing in any plain URL to bring up the usual sign-in page resulted in this first page, and pasting in the suggested URL led to a redirect to the second page, so essentially stuck in an infinite loop of uselessness.

I have the "airborne.gogo.whatever" URLs (the "My Flight" and "Delta Portal") URLs bookmarked, and those used to work before, but yesterday only led to the same frustrating infinite loop.

On a lark I tried a different browser -- my default, which got the two screens below, is Opera for Android. I switched to Chrome, and was able to login as normal. So presumably there is some plugin or Javascript idiocy that is causing this problem on browsers that they didn't test for.