Instructions for using the Delta Airlines Discount
Go to Delta.com
Enter your originating city and either Milwaukee (MKE) Chicago O'Hare (ORD) or Chicago Midway (MDW) and your dates of travel then click Meeting Event Code (highlighted on the image below)
Enter Code (NMEVR for US and Canada customer or NMEWY for all other international customers)
in the meeting code box (this box is highlighted on the image below). If your dates and cities are correct, click find flights.