I also got a letter with the UN-like logo from Augusta GA like Nugget. Their usage of "airfare" and "voucher" is strange.

Here it is:
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NOTE: You must respond no later than xxxxxxxx.
Dear xxxxxxx,
 I am pleased to inform you that you have been selected to receive (2) Roundtrip Airfare. Your Roundtrip Airfare's are valid for travel to major cities in the continental US of your choice. The retail value of the two roundtrip airfare is up to $1200. Certain restrictions apply.
 If you choose to decline the Roundtrip Airfare for (2), please contact us as soon as possible so we may issue the roundtrip airfare voucher's to an alternate recipient.
 Please call me today at 281-617-2230 to find out how you may also receive a $100 Gas Rebate Voucher.
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If there is already an expiration date, why should I call back to decline? And the tiny print at the bottom:
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No purchase necessary. Appointments are required to view a 60 minute presentation on travel services. If married, cohabitating or engaged, both individuals must attend together. Certain restrictions apply for travel for two. Airfare covers base fare only. Traveler is responsible for a $4.95 processing fee. A $50 pp deposit is required when requesting travel dates which will go towards covering the taxes and surcharges. This offer is not valid in states where prohibited.
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So basically, I have been selected to pay them $4.95, $50, and 60 minutes of my time. Thanks, but no thanks!

Also got a scammy letter (postmarked from Augusta GA) with this number as the only contact.  Looks like a timeshare scam, but it's unclear.  Claims I "have been selected to receive" free roundtrip airfare.  There's a logo at the top of the letter that looks like it may be "UN" but it's so stylized I can't really tell.

Didn't receive a call from this number, but it's the contact number on some sketchy timeshare presentation offer I received.  The company's name and address both aren't on the letter.