@RequestMapping(path = "/schedules")
public class SchedulesController {

    @GetMapping("/{area}/{subarea}")
    public MyObject getFlight(@PathVariable("area") String area, @PathVariable("subarea") String subarea,
                           MyModel model) {

        ...
        return new MyObject();
    }
}

@Data
public class MyModel {
    LocalDate datestamp,
    String leadName,
    String viceLeadName
}

@RequestMapping(path = "/schedules")
public class SchedulesController {

    @GetMapping("/{area}/{subarea}")
    public MyObject getFlight(@PathVariable("area") String area, @PathVariable("subarea") String subarea,
                            @RequestParam(value = "datestamp", required = false) @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate datestamp,
                            @RequestParam(value = "leadName", required = false) String leadName,
                            @RequestParam(value = "viceLeadName", required = false) String viceLeadName) {

        ...
        return new MyObject();
    }
}

@RequestMapping(path = "/schedules")
public class SchedulesController {

    @GetMapping("/{area}/{subarea}")
    public MyObject getFlight(MyModel model) {

        ...
        return new MyObject();
    }
}

@Data
public class MyModel {
    String area,
    String subArea,
    LocalDate datestamp,
    String leadName,
    String viceLeadName
}