Go to the Midway website. It says that elite members of both WorldPerks and OnePass will be upgraded starting 2 hours before departure on a space available basis. That's the same policy that America West has for OnePass members. The difference is unlike America West, Midway doesn't have its own FF program.
<font face="Verdana, Arial, Helvetica" size="2">Originally posted by MRJ1964:
Note that "Midway Airlines" is not mentioned here at all for "confirmed" upgrades.
</font>