These are the 4 types of sales indicator in travelling industry (specifically internal codes, related to flight tickets):
1 SITI (https://youtu.be/Xn45a6MP-lE?t=5)
2 SITO (https://youtu.be/Xn45a6MP-lE?t=18)
3 SOTI (https://youtu.be/Xn45a6MP-lE?t=27)
4 SOTO (https://youtu.be/Xn45a6MP-lE?t=35)
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