Originally Posted by
skywardhunter
There is one somewhere on here, sometime last year it was discussed and posted
It's not definitive. There are ones which are borderline and might be one or the other.
OP. It has been reported that I is Flex but the best way to know is if you have a booking code as you can tell from that. 4th letter from the right. F = Flex Plus / S = Flex / P = Saver / R = Special