These are the 4 types of sales indicator in travelling industry (specifically internal codes, related to flight tickets):
| 1 | SITI | Sold Inside Ticketed Inside |
| 2 | SITO | Sold Inside Ticketed Outside |
| 3 | SOTI | Sold Outside Ticketed Inside |
| 4 | SOTO | Sold Outside Ticketed Outside |
SITI-the most common
Sold In, Ticketed In [the country of origin]
You buy your ticket at DTW to fly from DTW to TYO.
SITO
Sold In, Ticketed Out [of the country of origin]
Kind of rare.
SOTI
Sold Out, Ticketed Inside
i.e. a ticket paid for in LAX for a customer in HKG that is issued when the customer checks in at HKG, or picks up the ticket there.
SOTO
Sold Out, Ticketed Out Inside- i.e., a ticket you buy in your country and mail to someone in another country, or an E-Ticket you purchase for someone in another country.
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