I took a travel survey from USAirways which promises 500 miles as a reward. The survey is long-ish, but I pass it along for your mileage-earning pleasure. And I assume that since the email said

Our goal is to come as close as possible to 100% membership
participation so please take a few minutes to complete the survey.

that it probably isn’t targeted and that everyone should be eligible. Of course I could be wrong!

Update: a reader writes:

It wouldn’t take my number (Gold Preferred), and the terms and conditions say: “No registration is required, however this offer is valid only to the individual recipients of this email …”

Still worth trying, I think, but it may not work for you.