Welcome to FT
djfuzz
It seems flights disappear from the Choose Flight list when inventory is unavailable; it would be nice to have them indicated as unavailable - otherwise you wonder where a flight is that is shown in the downloadable timetable.
With Choose Flight it would be nice to have an option to restrict the search to the airport you chose, excluding other co-terms in a city.
The tool seems constrained by how far ahead you can choose dates; it looks to be about a year but may vary by airline. With an RTW easily containing flights more than a year ahead, and the fact that no open segments are permitted; it means that you have to select wrong dates within the 12 month period and presumably phone up to move them after ticketing is done. Open segments would be useful here to fix this.