Initially I loved HipMunk but I came to find out the agenda they use in hiding flights does not mirror my preferences.

One recent example I was travelling from Detroit to LAX with my 94 year old father and I wanted a direct flight. HipMunk showed nothing but Delta.com showed four daily flights. Sure they were more expensive but I gladly paid the premium because my dad is too old to be running between gates.

No amount of sorting showed those flights on HipMunk. Maybe if they have the money they can build a preference layer.