Highest bonus I've ever seen. Odd in that this person does not have any business of any kind.
The invitation starts with 49441058 followed by four more numbers and the telephone number for the offer is 888-589-5039. The Offer Code is 1CM. The web site for the offer is www.RapidRewardsBizCard.com
and since it's a biz card the name is blank and the address can be changed. The offer expires August 8, 2016, there's a $3000 spend in 3 months required, there's an annual 6000 mile renewal bonus, and there's a $99 annual fee.
I haven't tried it myself as I first have to check if I had this exact card within the past 24 months.
Again, it's the Southwest Premier Business card.