Originally Posted by
yellow77
Question: ITA books this fare on VS and OK in Q class. Why does it use Q class and not Y class? Is this specified in some IATA table, or does it just use the lowest fare class available (so if I want a higher fare class, I should just wait?)? How do I find out what booking classes IATA fares like this one book into on different carriers?
One way to find out is to make a similar booking on different dates when a flight does not have Q availability and see if the fare still comes up. If it does in a different fare class, then multiple classes can be used. Otherwise, they can't.