In the fast few years airlines have been putting as little fuel in planes as they can get away with. Less fuel, less weight. I don’t like it at all.
I had a very inconvenient Southwest flight because of that last fall. DEN-BNA with a stop in MCI (KC). But there was a thunderstorm in KC so after circling for a while, the pilot said that fuel was getting low and that we would have to land in Topeka! Topeka doesn’t really have an airport though. No jetways. So we sat on the ground in the hot (100% full) plane waiting for the storm to pass. Could not deplane could not even open the doors. SUCKED!