- As others have said, the return of Travelocity's "Dream Map," but worldwide, and one that actually works and actually has seats at the fare quoted.

(VERY challenging due to the computational load required to analyze every destination from San Francisco to Sacramento to Santa Fe, determine the fares and then present them all.)

- Some mechanism to determine what airlines service what destinations on what days out of which hubs. Recently I was trying to determine who serviced the Cayman Islands. Once I figured that out I needed to figure out what hubs they flew out of, and then on what days they departed from those hubs.