<https://loyaltylobby.com/category/starwood-starwood-preferred-guest/>
<http://schema.org/name>
"Starwood Preferred Guest (SPG)"
<https://loyaltylobby.com/2016/12/02/spg-double-up-double-triple-delta-skymiles-in-us-canada-october-24-december-31-2016-targeted/>