I can see why travel planning startups fail but I don't think its for the reason implied that people don't want the service. I travel a lot and I always plan (to an extent) on line but I go to the best sites for the aspect required eg. for flights Skyscanner or Kayak, for accom booking.com or laterooms or hostelworld or airbnb. For what to see Tripadvisor. If I want combined hotel and flight, Expedia. For local bus times etc. Google Maps. They are mostly great services from billion dollar companies that have put in a lot of R&D. Why should I go to a new combined travel site trying to combine stuff in a half arsed way? To appeal to users it has to better than the existing solutions already available.