Another word, this OSI should be redundant for good UA agents who would see this from the frequent flyer field that you are 1K.

You would also think that their own system would not need this OSI information to perform any special logic.

Since it sounds like denCSA is in the know, I have some questions:

1 - I sometimes see a carrier code or YY after OSI, does that mean if you are at this carrier (and I suppose YY means all carriers), pay attention to the OSI? Or, the reservation system only transmits the OSI to the other carriers based on the 2 letters?

2 - Does the system validate the OSI field at all?

3 - There is also the SSR field. Is that more structured and scanned by the computer to do things like meal requests, language, wheelchair? Is it validated when entered?

4 - Does the frequent flyer information on SHARES go into the SSR field or it has its own field or both (for UA and OA)?

Thanks.