OSI — Other Service Information

OSI — Other Service Information

OSI is the free-text field within the PNR used to pass informational notes to the airline. It is a notification, not a request.

Fundamental Difference from SSR

An SSR (Special Service Request) requires action and confirmation from the airline — wheelchair, special meal and so on. An OSI is purely informational; no airline response is expected. A simple rule: 'Does the airline need to do something?' — Yes → SSR; No → OSI.

Common OSI Uses

Technical Structure

OSI lines are written within the PNR as a combination of airline code and free text, e.g. OSI YY VIP PASSENGER. 'YY' targets all airlines; a specific two-letter code targets only that carrier.

Privacy Note

Because OSI carries free text, there is a risk that sensitive personal data may be included. Under GDPR and similar regulations, OSI notes within PNRs must also comply with the principle of data minimisation.