This is awesome!! I can totally see myself using this :)
Two suggestions:
1) Maybe allow users to have a preview of the premium features (allow users to use it once or twice before locking) so it'll entice users to sign up for the free trial/join a plan
2) Not sure if you're already doing this but would be cool to see how the covid outbreak trends based on current data. Forecast the covid trends based on infection rate and the current vaccination rate. Because if I want to book a trip in a few months, I want to see if the covid rate in that country/state would be up by then