IATA Special Service Request Codes as defined in IATA Recommended Practice 1708/1715.
See below for defined codes ().
The list of Special Service Request Codes might be changed by IATA at any time. This is not tracked here. The list below is for one point in time.
Changed to string(4), 2020-09-18, by Ole Nymoen, as string(2) was an error.
