It's a poor choice in font IMO. It looks too pixelated and jagged. If they added a slight black outline, it wouldn't look so "high school photoshop." The site is clunky at times just going from page to page or navigating where things are as the widget boxes are bunched up.
I do like the search feature of Account Activity portion where I can limit my search or views of what is posted to my account - award redemptions, non-flight activity postings (car rentals, hotel), etc.