Ask HN: How would you make travel sites better?

I travel over a 100k miles a year for work and have a lot of down time sitting at airports and on the plane with no wifi, so I thought I'd start a new travel related side project that I only work on while I'm at an airport or on a plane (20 hours a week or so).

I want to build something that will actually benefit travellers and not just myself, so I'd love to know any pain points you have or any features you wish existed when you are planning your trips. I'm open to any and all ideas.