Starwood hotels in the Amex Fine Hotels and Resorts program includes most Luxury Collection Hotels, and St Regis hotels. But there are also a few hotels from the Westin, Le Meridien and W Hotels brands too.

With American Express Platinum, you can upgrade your Starwood Preferred Guest level to Gold with a simple phone call instead of 10 eligible stays every year. Gold SPG membership gives you 50% more points on eligible stays at Starwood hotels, as well as a number of other benefits. Since you need to link your Amex and SPG accounts, upgrading your SPG account is one of the 5 benefits you must apply for with your new Platinum account

Amex Fine Hotels and Resorts provides a number of benefits for every stay you book. One of the least known benefits is that each FHR stay at a Starwood hotel also earns SPG points and stay credits to upgrade to the Platinum level. Make sure call Amex to add your SPG account number to your American Express Travel account so the hotels can credit your stay to SPG.
If you stay at Starwood hotels frequently, think about also getting an Amex SPG card in addition to your Platinum card. This card allows you to earn an extra 2 SPG points per dollar for eligible stays. With your Gold membership, you can earn 5 points per dollar, whilst also getting free breakfast, guaranteed 4pm checkout and an amenity valued at $100