ITA Software's Matrix (original) is great for carrier force and booking code force. Here's Delta's M fare, limited to one-stop routings, on the preferred dates. A phone call can confirm Z availability.

http://www.flyertalk.com/forum/milea...-code-ita.html

This is how one would specify a DL M fare:

DTW:: DL+ / F BC=M
EZE:: DL+ / F BC=M

$2327.20 in US Dollars
1 adult @ $2327.20
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Changes to this ticket will incur a penalty fee.

This ticket has advance-purchase restrictions.


Airport legend:

DTW: Detroit Wayne County
ATL: Atlanta Hartsfield-Jackson
EZE: Buenos Aires Ministro Pistarini
Detroit, MI to Buenos Aires, Argentina: 5610 miles 13 hrs 20 min

Delta Air Lines Flight DL105 on a Boeing 757 (jet) in coach class
Departs Detroit, MI (DTW) Wed, Nov 24 4:30p 2 hrs 12 min
Arrives Atlanta, GA (ATL) 6:42p
Layover in Atlanta 1 hr 3 min
Delta Air Lines Flight DL101 on a Boeing 767 (jet) in coach class
(dinner, movie)
Departs Atlanta, GA (ATL) Wed, Nov 24 7:45p 10 hrs 5 min
Arrives Buenos Aires, Argentina (EZE) Thur, Nov 25 7:50a
Note: The flight from Atlanta (ATL) to Buenos Aires (EZE) is overnight.


Buenos Aires, Argentina to Detroit, MI: 5610 miles 13 hrs 57 min

Delta Air Lines Flight DL110 on a Boeing 767 (jet) in coach class
(dinner, movie)
Departs Buenos Aires, Argentina (EZE) Sat, Nov 27 9:30p 10 hrs 20 min
Arrives Atlanta, GA (ATL) Sun, Nov 28 5:50a
Layover in Atlanta 1 hr 40 min
Delta Air Lines Flight DL104 on a Boeing 757 (jet) in coach class
Departs Atlanta, GA (ATL) Sun, Nov 28 7:30a 1 hr 57 min
Arrives Detroit, MI (DTW) 9:27a

By the way: that prices as $8,084/person as a J/D fare confirmed in First/Business today.