I've noticed that delta.com cannot show award space on AeroMexico after Oct 1, 2013, even same flight is searchable and bookable at either AirFrance or Alaska's website.
In this case, how do I book AM ticket with Delta miles? If I need to call them, which fare code I should use for economy class? According to
http://www.flyertalk.com/forum/delta...er-thread.html, it looks like Award classes (J/Y) is either C/Z or U. I assume those codes are all pre-10/1/2013?