Other Service Information (OSI) requests are messages sent directly to the supplier to communicate traveler preferences or requirements. OSIs are used only for air segments. OSIs are typically used to notify a supplier of special circumstances such as a passenger that does not speak the local language.
Unlike SSRs, OSIs are informational only and do not require the supplier to take action.
Exceptions
Galileo
Galileo supports 1-99 characters in free text for OSIs.
ACH
ACH does not have a character limit for free text.
RCS
RCS has a limit of 64 characters in free text.
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