Travel system should provide comprehensive alternatives - just enter where you are and where you need to be.
The minor costs can really add up.
Automatically suggest the best options with a few selectors or options.
If an alternate airport and rental car (including taxes, fees and parking) would be cheaper than an airport hotel and taxi. (This information is available in travel guides, but takes a lot of research to make the best choices.)
Include public transit choices (most major ones have a trip planner, at least link to these, if not tie-in for comprehensive cost evaluation)
If a longer route is worth the expense of staff time spent in transit. (use my pay rate and cost of benefits/hr to help make smart decisions)
Hotels which meet actual traveler needs, not the ones that have preferred status because they price at the max fed rate. (Sometimes, even a campground is most suitable for my needs)
What is the cost of flying s driving to that meeting? Is someone else going the same place at the same time? Does that change the value proposition if we ride-share?