Looks neat.

If I enter an 'aggressive' timeframe, is it intentional that it assumes I have longer time than shown? (Sydney to Hobart, no waypoints, 4 days - it insists that the minimum time this trip can take is 11 days).

Small UX things - I like to tab between fields, and use keyboard shortcuts for drop-downs - I would like to be able to select '2 tourists' by pressing the number 2. Date-pickers are always horrible - Monday as first day of week would be great, option to text-enter ISO periods ditto.