So once again, Kenya Airways, CAN-BKK. The regular economy here is E, according to the matrix. But I don't know what is the fare class for Economy Flex. I went through all the fare rules stated in KQ website, but didn't find it. Can someone tell me what booking class is this, and how should I look it up?

Also how funny is, that the "recommended" tag is above the cheapest option, not at one of the more expensive ones. Cute.