Instructions accompanying the voucher, which is designed to resemble a check, said the recipient must redeem it by Jan. 28 to receive the $1,298 in air fares.
The voucher also states, "This is not a timeshare or land sales offer."
A report on Fodors.com (www.fodors.com/news/story_4845.html) says dozens of Fodor's members have reported receiving a similar voucher.
Those who contacted U.S. Airlines said they were told that, to receive the two round-trip airline tickets, they had to attend a 90-minute presentation for "travel membership" packages or vacation clubs that involved sign-up fees of as much as $7,000, Fodors.com said.
Fodors.com also said its editors tried numerous times to contact representatives of U.S. Airlines, and no calls were returned.