You lost me at requiring registering an account to see flight availability. You need to give some value before asking for my contact info.
Too many free alternatives exist that don't gate their search results.
If your premium features are worth it - I'll register. If you want my info - maybe capture it with an offer for an alert after I do my initial query.
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In terms of feedback on the broader platform and idea - I think you may be confusing two different audiences. Travel hackers and average reward consumers are different consumers - Your messaging "free flights using points" and attempt to monetize with credit card offers are targeting average consumers - but your search engine and the headache/problem you are trying to solve is really a travel hacker problem - and honestly - its not really a problem - I kinda Enjoy The Hunt!