I feel like every web site with a “Keep Me Logged In” checkbox should have a FAQ entry titled “Why Doesn't The ‘Keep Me Logged In’ Checkbox Keep Me Logged In,” and the answer should be “Because we hate you.”
To everyone saying this is a browser issue, I assure you it isn't. The thing that triggered this annoyance was Delta's website which, despite having a “Remember Me” checkbox, also has a countdown timer to getting logged out after some time. Someone suggested that it might be related to PCI-DSS compliance: like maybe it remembers me as long as I don't do anything that triggers that flow (like searching for a flight, lol) but then it HAS to log me out for applicable regulatory compliance purposes.
@joeycastillo However, their Android app doesn't seem to do the same thing, which makes me wonder about it being for regulatory compliance...