I come across this today on another board.
Have never seen it myself. Cannot find any info on it on the websites of Southwest or Hersheys....
Here is the post...
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Here is the scoop on the Hershey's/Southwest Airline deal (taken from the form):

Hershey's Save and Soar. Collect Hershey's candy bar wrappers and earn FREE travel on Southwest Airlines. How it works: Collect 50 wrappers and receive a gift certificate for $10 off a one-way or $50 off a round trip travel. Collect 275 wrappers and receive a free gift certificate ($150 value). Plus, you will be entered in a sweepstakes to win a trip to Super Bowl XXXVII.

Participation is limited to legal U.S. residents 18 years of age or older at time of entry. To participate in the program, type or print your name, address, city, state, and zip code on a plain 3 1/2 X 5" card or official entry form and enclose the appropriate number of UPCs (50 - 274 UPCs = 1 $10 or $25 gift certificate. 275 or more UPCs = 1 $150 gift certificate. Mail to Hershey's Southwest Certificate Offer, PO Box 3016 Rogers MN 55374-3016. Entries must be received by 01/31/01. Limit one entry per mailing envelop per person. Offer subject to Official Rules available at point of sale or send a S.A.S.E. to Hershey's Southwest Certificate Offer, PO Box 3010 Rogers MN 55374-3016. Residents of WA and VT neen not affix postage to be returned. Void where prohibited. Subject to federal, state, and local laws. Participation in the Save & Soar Program will automatically enter you into the Super Bowl XXXVI Sweepstakes.

This form had an attached coupon for the following Hershey's Candy bars:
Hershey's, Reese's, KitKat, York, Peter Paul, Twizzlers, Caramelo, PayDay, Rolo, and Health were words written on the coupon. The candy bars pictured on the coupon are: Twizzlers, York, Almond Joy, Mounds, Payday, Hershey (the regular one without almonds), Reeses Peanute Butter Cups, Reeses Sticks, and KitKat.

This sweepstakes form left MANY questions unanswered:
1. What size bars must be purchased?
2. Are all varieties of Hershey's allowed (i.e., Hershey's Cookies & Cream)or are the bars limited to the ones on the attached coupon?
3. What exactly is meant by "Limit one entry per mailing envelop per person"? Does this mean that a family of four could send in 4 entries in one envelop? Does this mean that one person could send in 10 entries (each set in a seperate envelop)?
4. Can you combine the GCs? I.e., for a $99 trip, can you combine 2 $50 GCs?

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I have learned that eligable sizes for bars are 1.4 oz. up to 3.5 oz.
Has anyone else seen this? Is it legit?