Originally Posted by RealHJ

Go to delta.com and check the fare rules under any mock int'l award booking. You will see that only KE, CI and MU (not MH) have blackout dates.

This is what I saved half a year ago. If you check now, you can get the more up to date dates. (So unless something has changed over the last 6 months, MU should have no blackout dates.)

GENERAL RULES TEXT

***KE***
IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY KE FLIGHT OR IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY KE FLIGHT IN COMBINATION WITH ONE OR MORE OF THE FOLLOWING ANY 9W FLIGHT ANY AF FLIGHT ANY AM FLIGHT ANY AS FLIGHT ANY AV FLIGHT ANY AZ FLIGHT ANY CI FLIGHT ANY CZ FLIGHT ANY DL FLIGHT ANY HA FLIGHT ANY IT FLIGHT ANY KE FLIGHT ANY KL FLIGHT ANY KQ FLIGHT ANY MH FLIGHT ANY MU FLIGHT ANY OK FLIGHT ANY SU FLIGHT ANY TN FLIGHT ANY UX FLIGHT ANY VA FLIGHT ANY RO FLIGHT ANY VN FLIGHT
TRAVEL IS NOT PERMITTED 11DEC 10 THROUGH 31DEC 10 OR 01JAN 11 THROUGH 09JAN 11 OR 01FEB 11 THROUGH 07FEB 11 OR 26FEB 11 THROUGH 01MAR 11 OR 05MAY 11 THROUGH 10MAY 11 OR 20MAY 11 THROUGH 03JUL 11 OR 16JUL 11 THROUGH 28AUG 11 OR 10SEP 11 THROUGH 14SEP 11 OR 01OCT 11 THROUGH 03OCT 11 OR 09DEC 11 THROUGH 31DEC 11.

***CI***
IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY CI FLIGHT OR IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY CI FLIGHT IN COMBINATION WITH ONE OR MORE OF THE FOLLOWING ANY 9W FLIGHT ANY AF FLIGHT ANY AM FLIGHT ANY AS FLIGHT ANY AV FLIGHT ANY AZ FLIGHT ANY CI FLIGHT ANY CZ FLIGHT ANY DL FLIGHT ANY HA FLIGHT ANY IT FLIGHT ANY KE FLIGHT ANY KL FLIGHT ANY KQ FLIGHT ANY MH FLIGHT ANY MU FLIGHT ANY OK FLIGHT ANY SU FLIGHT ANY TN FLIGHT ANY UX FLIGHT ANY VA FLIGHT ANY RO FLIGHT ANY VN FLIGHT
TRAVEL IS NOT PERMITTED 10DEC 10 THROUGH 31DEC 10 OR 01JAN 11 THROUGH 04JAN 11 OR 27JAN 11 THROUGH 06FEB 11 OR 01JUN 11 THROUGH 31AUG 11 OR 10DEC 11 THROUGH 31DEC 11 OR 01JAN 12 THROUGH 04JAN 12.

***MU***
IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY MU FLIGHT OR IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY MU FLIGHT IN COMBINATION WITH ONE OR MORE OF THE FOLLOWING ANY 9W FLIGHT ANY AF FLIGHT ANY AM FLIGHT ANY AS FLIGHT ANY AV FLIGHT ANY AZ FLIGHT ANY CI FLIGHT ANY CZ FLIGHT ANY DL FLIGHT ANY HA FLIGHT ANY IT FLIGHT ANY KE FLIGHT ANY KL FLIGHT ANY KQ FLIGHT ANY MH FLIGHT ANY MU FLIGHT ANY OK FLIGHT ANY SU FLIGHT ANY TN FLIGHT ANY UX FLIGHT ANY VA FLIGHT ANY RO FLIGHT ANY VN
FLIGHT TRAVEL IS NOT PERMITTED 04OCT 10 THROUGH 15OCT 10 OR ON 20NOV 10 OR ON 06DEC 10 OR 10DEC 10 THROUGH 24DEC 10 OR 01JAN 11 THROUGH 02JAN 11 OR ON 25JAN 11 OR 01FEB 11 THROUGH 04FEB 11 OR 06FEB 11 THROUGH 07FEB 11 OR ON 10FEB 11 OR ON 16FEB 11 OR ON 29APR 11 OR ON 03MAY 11 OR 10SEP 11 THROUGH 11SEP 11 OR ON 13SEP 11 OR ON 15SEP 11 OR ON 26SEP 11 OR 29SEP 11 THROUGH 04OCT 11 OR 06OCT 11 THROUGH 08OCT 11.