Why can't I connect to airport Wi-Fi networks? (Pixel XL)

I have no problem signing in to my home wi-fi, but when it comes to public wi-fi networks such as airports, I am not redirected to their "accept terms" pages to proceed with the connection. I was just in Philly airport and there was an attempt at the redirect, but then I was hit with a security screen that wouldn't let me proceed because I wasn't on a secure connection.

Now I am in Detroit airport and all I get is a connection to the network with no internet, and no option to "accept the terms." Has anyone else experience these issues?

I am using a Pixel XL.

Could be the crappy airport Wi-Fi. When I traveled to Europe Wi-Fi was iffy and I was lucky if I could connect at all.