why the hell would you ever want to shower in an airport? You held out for 15 hours, might as well wait 1 more hour or whatever it is until you get to your hotel or get home to shower.
lots I like and lots I dislike about united. Last 3 flights the onboard entertainment has not worked properly. Terrible lounges that rarely have showers, so no way to freshen up after your 10-15 hr flight or travel. However excellent FF scheme and awards travel. Flying in and out of africa the equipment tended to be older and was a pain in the butt.