Well here is the Midwest Winter Waiver from Delta.
http://www.delta.com/traveling_check...er12/index.jsp
Midwest Winter Weather
Last Updated: February 23, 2012, 6pm EST
Winter weather has impacted travel to, from, or through various cities in the Midwest. Check flight status frequently for up-to-the-minute info about your flight plans, or get updates sent directly to your wireless device or email with Delta Messenger.
Rescheduling Flights
If your flight is canceled or significantly delayed, you are entitled to a refund. Even if your flight is not canceled, you may make a one-time change to your ticket without fee if you are scheduled to travel to, from, or through the following cities on Delta, Delta Connection®, or Delta-coded flights during the specified time periods listed below.
You can now edit your itinerary here at delta.com, or you may contact Reservation Sales to make changes to your itinerary. Additional collection in fares may apply. See Conditions & Restrictions below.
Affected Destination(s)
(To, From, or Through) Impacted Travel Date(s) Ticket must
be Reissued
On or Before Rebooked Travel
must begin
no later than
Cedar Rapids, IA (CID)
Chicago-Midway, IL (MDW)
Chicago-O'Hare, IL (ORD)
Detroit, MI (DTW)
Des Moines, IA (DSM)
Flint, MI (FNT)
Fort Dodge, IA (FOD)
Grand Rapids, MI (GRR)
Lansing, MI (LAN)
Kalamazoo, MI (AZO)
Madison, WI (MSN)
Mason City, IA (MCW)
Milwaukee, WI (MKE)
Moline, IL (MLI)
Sioux City, IA (SUX)
South Bend, IN (SBN)
Waterloo, IA (ALO)
Feb 23-24, 2012 Feb 27, 2012 Feb 27, 2012
Conditions & Restrictions
Changes to origins and destinations may result in an increase in fare. Any difference in fare between your original ticket and the new ticket will be collected at the time of booking.