To give the OP a helping hand I can tell him that all flights DTW-EZE are over ATL and that Z class is available ATL-EZE on 11/23 and 11/25 (no 11/24) and the return EZE-ATL is available on 11/28.

That is the important segment and as a PM he can figure out how to handle the domestic connections if all are not available Z or G.

If I were trying to get the PMU upgrades I would consider that to be very good availability.