I’m going to make an unjustified assumption here, so please do tell me if I’m wrong. I’m going to make a guess that you’ve not noticed the difference between how economy fares work out of Atlanta or Dallas versus those out of Athens (I assume we’re talking about the one in Greece). While sure, fully flexible Y fares are extremely rare whether corporate or personal, it is extremely common and perhaps even most common for commercial EU flights to have some element of flexibility in Y fares - particularly “last day changes” which is what I mainly end up with nowadays.

You would do well to learn from often1 here.