A reservation process allows customers to reserve a flight, hotel room, and rental car as...

To display the Select flight insurance check box only when the itinerary includes a flight, you can apply a visibility condition (When rule) to the check box. A visibility condition is a rule that determines whether a UI element is visible or hidden based on a logical expression or a reference to another rule. A When rule is a rule that defines a true-false test based on property values, constants, or other factors. References: https://community.pega.com/knowledgebase/articles/user-experience/86/configuring-visibility-conditions