I like the popup calendar idea - but don't like either the calendars or date pulldowns that show return flights before your outbound flight. I also like the ability to view all area airports at once (WAS, NCY, etc) and screens that show return flights from all airports - it's often more convenient (and sometimes cheaper) to fly into National and out of BWI, for example. I also want to see the full fare at first glance and not to go through several screens to find. CO used to do this, but dropped it a year or so ago. I also like the ability to look for alternative dates or airports. And, of course, the ability to go back to a previous screen without losing all the data.