def get_agency_url(operator_code):
    """Get url for operators"""
    operator_urls = {
        'OId_LUL': "https://tfl.gov.uk/maps/track/tube",
        'OId_DLR': "https://tfl.gov.uk/modes/dlr/",
        'OId_TRS': "https://www.thamesriverservices.co.uk/",
        'OId_CCR': "https://www.citycruises.com/",
        'OId_CV': "https://www.thamesclippers.com/",
        'OId_WFF': "https://tfl.gov.uk/modes/river/woolwich-ferry",
        'OId_TCL': "https://tfl.gov.uk/modes/trams/",
        'OId_EAL': "https://www.emiratesairline.co.uk/",
        #'OId_CRC': "https://www.crownrivercruise.co.uk/",
    }
    if operator_code in list(operator_urls.keys()):
        return operator_urls[operator_code]
    else:
        return "NA"