By clicking this, user will be able to apply filters separately for both onward and return flight by Time, Stops, Airlines along with Staring Price, Refundable.
Apply button will save and apply the filters on flight results.
once user has applied filter on trip-1 and moved to trip-2, then the filters applied on trip-1 will be autosaved and vice-versa.
Rules and Validations:
A user should be able to reset the filter in case, if he has applied too many filters. User can select more than one filtering criteria to filter results as a combination of different filters. User should be able to filter onward and return flight separately in case of Roundtrip search Refundable/non-refundable tag is not shown on domestic-round trips but filter will be applied as the response contain information at the backend