public int remove(Long objId){
        for(Town i: towns){
            if(i.getId().equals(objId)){			
                towns.remove(i);		
                return 0;		
            }
        }	
        for(Airport i: aports){
            if(i.getAirportId().equals(objId)){		
                aports.remove(i);		
                return 0;		
            }	
        }
        return 0;
    }