Originally Posted by
elruso
As far as I understand, the TI1, TINDR1 and TIND1 codes are special rates for travel industry professionals, that is, people who work for travel agencies.
The main difference from any corporate rate is that there is a well-known document that identifies you as travel industry professional : IATA card.
If you don't have one, the chance you get caught is very high.
In the multiple times I used the TI1 code as well as the many others here, no one EVER had problems or were asked for an IATA card. Not to say it couldn't happen, but it never did in all the many reservations that were made.