The American Categorical Platinum card was first launched in 1984, to have fun the fortieth anniversary there are a variety of restricted time AmEx provides for Platinum cardholders:
Hilton: Spend $180, get $40 again. Legitimate till 7/31/24
jetBlue: Spend $200, get $50 again. Legitimate till 8/6/24
Delta: Spend $180 by way of Amex Journey and get $40 again. Legitimate till 7/5/24
Hertz: Spend $150 and get $40 again. Legitimate till 6/30/24
Some good offers above, as at all times might be stacked with different provides to make it even higher.