Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for presenting graphical user interfaces comprising multiple components interrelated such that inputs received in one component of a graphical user interface render automatic and corresponding updates for another component of the graphical user interface. In one aspect, a method includes the actions of presenting a graphical user interface; and receiving user input of one or more parameters, the graphical user interface including a calendar portion and an associated graphical portion, the calendar portion comprising a date box for each date in a range of dates, and the graphical portion specifying non-date parameters for trips beginning on each date of the range of dates. A change in the calendar portion of the graphical user interface automatically renders a corresponding change in the graphical portion of the graphical user interface.