MAN stands for Manchester Airport, while ROB stands for Monrovia Roberts Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Birmingham Airport (BHX), Leeds/Bradford Airport (LBA), Nottingham East Midlands Airport (EMA), Grimsby Humberside Airport (HUY), Doncaster Sheffield Airport (DSA) are other airports near this flight route and their unique identifiers/IATA codes.